MarketsCastingsStampingSourcing SolutionsAbout UsWhy Sigma
Electrical

An extensive range of robust fittings and weatherproof products.

Automotive

Connectivity solutions such as high brackets, busbars, and connector pins.

Power Transmission & Distribution

Connectors & structural components for cutouts, transformers, & substations.

Aerospace

Complex sensor housings & fracture-critical products.

Appliances

Robust castings and assemblies for everyday appliances.

Commercial Hardware

Finished components for commercial & residential hardware applications.

Electronics & Telecom

Precision metal stamped sensors, connectors and cast housings & covers.

Fluid Power

Durable, precision products for high-pressure applications.

Food & Beverage

Handles, leveling pins, flow valves & button housings.

Lighting

Custom housings to fully assembled commercial & industrial light fixtures.

Marine

Durable corrosion-resistant engineered castings and subassemblies.

Medical & Dental

Medical-grade parts for implants, housings, manifolds, and pumps.

Oil & Gas

Custom housings and covers for flow control, pressure valves & meters.

Power Tools

Durable yet lightweight custom metal housings.

Solar

Innovative precision metal stamped parts.

High Pressure Die Casting

High-pressure liquid metal is pressed into a precision metal mold cavity, and then cooled & solidified under pressure.

Ideal for a wide range of applications, including automotive, agricultural, electronics, and medical.

Sand Casting

Castings with complex shapes & inner cavities that are produced in a sand mold

Ideal for parts with complex shapes and inner cavities

Gravity Die Casting

A mold is filled with liquid metal using gravity and cooled and solidified in the mold to obtain a casting

Ideal for parts with complex shapes made with steel, aluminum or magnesium alloys

Investment Casting

A process used to obtain a mold without a parting surface; creates parts with high dimensional & geometric accuracy

Ideal for near-net shaped parts with complex shapes and high precision requirements

Partner Services

Custom Tooling, Machining, Surface Finishing, Special Purpose Machine Design & Development

Precision Metal Stamping

More than 80 presses convert metal sheets into custom parts

Ideal for parts for electronic connectors and microprocessor chips

Swiss Screw Machining

A specialized CNC machine capable of producing extremely small, precise parts

Ideal for complex miniature screws, contact pins & micro-fasteners

Partner Services

Rapid Prototypes, Heat Treating, Automated Assembly

Company History

Learn more about our company milestones.

Plant Locations

Learn more about our global manufacturing facilities.

Company News

See our company announcements and press releases.

Contact Us

Let us know how we can help create a solution for you

Resources

Download catalogs and key product guides.

Global Code of Conduct

Download our Code of Conduct and report violations.

Innovation at Sigma

Purposeful innovation – the continual improvement and innovation of custom-designed and precision-made products and solutions.

Engineered Solutions

Sigma offers solutions for complex product characteristics and technical requirements.

Global Supply Chain Management

U.S.-based supply chain management teams support our customers.

Partner Services

Sigma is a vertically integrated single-source solution provider.

Sustainability at Sigma

Our commitment to excellence drives us to build a better, more sustainable future in all aspects of our operations.

Safety at Sigma

Safety is more than just a priority at Sigma Engineered Solutions – it’s a core value.

Connection Type: While-In-Use

< Products

One-Gang While-In-Use Receptacle Cover – 3-1/8″ Deep

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): While-In-Use
Feature(s): Extra Duty RatedHorizontalVertical

One-gang in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 16 configurations
  • Adaptable for GFCI, duplex, round and switch devices
  • 3-1/8″ deep
  • For vertical or horizontal installation
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number
Gray WM10MDG1
White WM10MDW1
Bronze WM10MDA
ABC
5.984.023.12
cULus: E121488
cCSAus: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

One-Gang While-In-Use Receptacle Cover – 2-1/4″ Deep

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): While-In-Use
Feature(s): Extra Duty RatedHorizontalVertical

One-gang in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 16 configurations
  • Adaptable for GFCI, duplex, round and switch devices
  • 2-1/4″ deep
  • For vertical or horizontal installation
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number
Gray WM10MSG1
White WM10MSW1
Bronze WM10MSA
ABC
5.984.022.64
cULus: E121488
cCSAus: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

Two-Gang While-In-Use Receptacle Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 2-Gang
Connection Type(s): While-In-Use
Feature(s): Extra Duty Rated

Two-gang in-use receptacle covers allow two receptacles to be utilized while the cover is closed in wet, damp or dry locations.

  • 55 configurations
  • Each side is adaptable for GFCI, duplex, round and switch devices
  • 3-1/8″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number
Clear WL21MMDTG1
Bronze WL21MMDA1
Gray WL21MMDG1
White WL21MMDW1
ABC
6.025.633.5
cULus: E332841
cCSAus: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

One-Gang While-In-Use Receptacle Cover – 3-1/8″ Deep

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): While-In-Use
Feature(s): Extra Duty RatedHorizontalVertical

One-gang in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 16 configurations
  • Adaptable for GFCI, duplex, round and switch devices
  • 3-1/8″ deep
  • For vertical or horizontal installation
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number
Clear WL10MDTG1
Bronze WL10MDA1
Gray WL10MDG1
White WL10MDW1
cULus: E332841
cCSAus: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

One-Gang While-In-Use Receptacle Cover – 2-1/4″ Deep

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): While-In-Use
Feature(s): Extra Duty RatedHorizontalVertical

One-gang in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 16 configurations
  • Adaptable for GFCI, duplex, round and switch devices
  • 2-1/4″ deep
  • For vertical or horizontal installation
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number
Clear WL10MSTG1
Bronze WL10MSA1
Gray WL10MSG1
White WL10MSW1
cULus: E332841
cCSAus: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

Two-Gang While-In-Use Receptacle Cover

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Cover
Type(s): 2-Gang
Connection Type(s): While-In-Use

Two-gang in-use receptacle covers allow two receptacles to be utilized while the cover is closed in wet, damp or dry locations.

  • 55 configurations
  • Each side is adaptable for GFCI, duplex, round and switch devices
  • 3-1/8″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number
Gray WM21MMDG1
White WM21MMDW1
Bronze WM21MMDA1
UL: E121488
CSA: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

Slimline While-In-Use Vertical Receptacle Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): SlimlineWhile-In-Use
Feature(s): Extra Duty RatedVertical

Slimline in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 15 Amp rated and adaptable for GFCI and duplex receptacles
  • For vertical installations
  • Low profile, only 1-9/16″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color Model Number
Gray WL14STVTG1
cCSAus: 174008
Standards: UL 514D & UL 498A, CSA C22.2 No. 42.1-13 & CSA C22.2 No. 42-10
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

Slimline While-In-Use Vertical Receptacle Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): SlimlineWhile-In-Use
Feature(s): Extra Duty RatedVertical

Slimline in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 15 Amp rated and adaptable for GFCI and duplex receptacles
  • For vertical installations
  • Low profile, only 1-9/16″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number
Gray WL14STVG1
White WL14STVW1
ABC
5.513.581.56
cCSAus: 174008
Standards: UL 514D & UL 498A, CSA C22.2 No. 42.1-13 & CSA C22.2 No. 42-10
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

Slimline While-In-Use Horizontal Receptacle Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): SlimlineWhile-In-Use
Feature(s): Extra Duty RatedHorizontal

Slimline in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 15 Amp rated and adaptable for GFCI and duplex receptacles
  • For horizontal installations
  • Low profile, only 1-9/16″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color Model Number
Gray WL14STHTG1
cCSAus: 174008
Standards: UL 514D & UL 498A, CSA C22.2 No. 42.1-13 & CSA C22.2 No. 42-10
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

Slimline While-In-Use Horizontal Receptacle Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): SlimlineWhile-In-Use
Feature(s): Extra Duty RatedHorizontal

Slimline in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 15 Amp rated and adaptable for GFCI and duplex receptacles
  • For horizontal installations
  • Low profile, only 1-9/16″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number
Gray WL14STHG1
White WL14STHW1
ABC
5.773.951.56
cCSAus: 174008
Standards: UL 514D & UL 498A, CSA C22.2 No. 42.1-13 & CSA C22.2 No. 42-10
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

Two-Gang While-In-Use Receptacle Cover

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Cover
Type(s): 2-Gang
Connection Type(s): While-In-Use
Feature(s): Extra Duty Rated

Two-gang in-use receptacle covers allow two receptacles to be utilized while the cover is closed in wet, damp or dry locations.

  • 55 configurations
  • Each side is adaptable for GFCI, duplex, round and switch devices
  • 3-1/8″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color Model Number Master Pack Quantity UPC
Gray 14433 2 031857144333
ABC
6.025.553.5
cULus: E121488
cCSAus: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

One-Gang While-In-Use Receptacle Cover

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): While-In-Use
Feature(s): Extra Duty RatedHorizontalVertical

One-gang in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 16 configurations
  • Adaptable for GFCI, duplex, round and switch devices
  • 2-1/4″ deep
  • For vertical or horizontal installation
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color Model Number Master Pack Quantity UPC
Gray 14434 4 031857144340
ABC
5.984.022.64
cULus: E121488
cCSAus: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

Two-Gang While-In-Use Receptacle Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 2-Gang
Connection Type(s): While-In-Use
Feature(s): Extra Duty Rated

Two-gang in-use receptacle covers allow two receptacles to be utilized while the cover is closed in wet, damp or dry locations.

  • 55 configurations
  • Each side is adaptable for GFCI, duplex, round and switch devices
  • 3-1/8″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number Master Pack Quantity UPC
Clear 14426CL 4 031857544263
Bronze 14426BR 4 031857344269
Gray 14426 4 031857144265
ABC
6.025.633.5
cULus: E332841
cCSAus: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

Slimline While-In-Use Vertical Receptacle Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): SlimlineWhile-In-Use
Feature(s): Extra Duty RatedVertical

Slimline in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 15 Amp rated and adaptable for GFCI and duplex receptacles
  • For vertical installations
  • Low profile, only 1-9/16″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number Master Pack Quantity UPC
Clear 14440CL 6 031857544409
Gray 14440 6 031857144401
White 14440WH 6 031857644406
ABC
5.513.581.56
cCSAus: 174008
Standards: UL 514D & UL 498A, CSA C22.2 No. 42.1-13 & CSA C22.2 No. 42-10
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

Slimline While-In-Use Horizontal Receptacle Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): SlimlineWhile-In-Use
Feature(s): Extra Duty RatedHorizontal

Slimline in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 15 Amp rated and adaptable for GFCI and duplex receptacles
  • For horizontal installations
  • Low profile, only 1-9/16″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number Master Pack Quantity UPC
Clear 14441CL 4 031857544416
Gray 14441 4 031857144418
White 14441WH 4 031857644413
ABC
5.773.951.56
cCSAus: 174008
Standards: UL 514D & UL 498A, CSA C22.2 No. 42.1-13 & CSA C22.2 No. 42-10
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

One-Gang While-In-Use Receptacle Cover

Material: Non-Metallic
Category: Weatherproof
Sub Category: Cover
Type(s): 1-Gang
Connection Type(s): While-In-Use
Feature(s): Extra Duty RatedHorizontalVertical

One-gang in-use receptacle covers allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • 16 configurations
  • Adaptable for GFCI, duplex, round and switch devices
  • 2-1/4″ deep
  • For vertical or horizontal installation
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes adaptor plates, pre-installed gasket and hardware
Color
Color Model Number Master Pack Quantity UPC
Clear 14414CL 6 031857541460
Bronze 14414BR 6 031857344146
Gray 14414 6 031857144142
White 14414WH 6 031857644147
cULus: E332841
cCSAus: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

One-Gang While-In-Use GFCI Receptacle Kit

Material: Non-Metallic
Category: Weatherproof
Sub Category: BoxCoverKit
Type(s): 1-Gang
Connection Type(s): GFCIWhile-In-Use
Feature(s): Extra Duty RatedHorizontalVertical

One-gang in-use receptacle kits allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • For vertical or horizontal mounting with the corner hinge
  • 15-Amp tamper-resistant, weather-resistant GFCI receptacle included
  • 2-1/4″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes one-gang metal box with three 1/2″ holes, one-gang while-in-use cover, TRWR GFCI receptacle, closure plugs, pre-installed gasket and hardware
Color
Color Model Number Master Pack Quantity UPC
Clear 16801 4 031857168018
White 16801WH 4 031857668013
ABC
5.984.024.65
cULus: E324138
cCSAus: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.

< Products

One-Gang While-In-Use GFCI Receptacle Kit

Material: Metal Die-Cast
Category: Weatherproof
Sub Category: BoxCoverKit
Type(s): 1-Gang
Connection Type(s): GFCIWhile-In-Use
Feature(s): Extra Duty RatedHorizontalVertical

One-gang in-use receptacle kits allow an outlet to be utilized while the cover is closed in wet, damp or dry locations.

  • For vertical or horizontal mounting with the corner hinge
  • 15-Amp tamper-resistant, weather-resistant GFCI receptacle included
  • 3-1/8″ deep
  • Lockable
  • Meets NEMA 3R and NEC’s “Extra Duty” Requirement
  • Includes one-gang metal box with three 1/2″ holes, one-gang while-in-use cover, TRWR GFCI receptacle, closure plugs, pre-installed gasket and hardware
Color Model Number Master Pack Quantity UPC
Gray 16802 4 031857168025
AB
4.543.66
cULus: E324138
cCSAus: 174008
Standards: UL 514D, CSA C22.2 No. 42.1-13
NEMA: NEMA 3R
Other: NEC 2020 Extra Duty
65!

WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.