Check it out! New Mainline Faucet Collections!

ALL PRODUCTS
Bathrooms

Kitchen

Commercial

Stops & Supplies

Fittings

Valves

Tubular

water system

Chemicals & Adhesives

Drains

Rough Plumbing

Specialties

Hangers & Fastners

Bath Accessories

Hand Showers

Lavatory Drains

Lavatory Faucets

Lavatory Sinks

Rough-in Valves

Shower Components

Shower Drains

Shower Heads

Shower Kits

Toilet Seats

Toilets

Tub Spouts

Bar Faucets

Kitchen Faucet

Laundry Faucet

Sink Strainer

Sink Collections

Soap Dispensers

Sink Bottom Grids

Utility Cabinet W/Sink & Faucet

Decorative Strainers

Commercial Accessories

Commercial Lav Sinks

Commercial Toilet Seats

Faucets

Grab Bars

Grid Drains

Gas Connector

Stops

Connectors

Push-to-Connect Fittings

Bar stock fittings

F2159 Poly Pex Fittings

F1807 Brass Pex Fittings

Boiler Drain Valves

Frost Free Faucets

Ball Valves

Brass Tubular

Flanges

Tubular Components

Transfer Pumps

Sump Pumps

Sewage Pumps

Utility Pumps

Battery Back-ups

Condensate Pumps

Effluent Pumps

Jet Pumps

PVC/ABS Valves

Remote Sink/Drain Pump System

Cements

Trap Seals

Tub Boxes & Liners

Ice maker Outlet Boxes

Drain Pans

Fire Rated Outlet Boxes

Installation Accessories

Multi Box Outlet Boxes

Roof Flashings

Test Plugs

Washing Machine Outlet Box

Leak detection kits

Roto Molded Coolers

Pipe Clamps, Insulators & J-Hooks
About Mainline®
Resources
Where to Buy
Find Parts

Test Plugs

Show 12 20 30 All

4″ Standard PR Pneumatic Test Ball Plug

Model #: ML83588

Model: ML83588

View products

3″ Standard PR Pneumatic Test Ball Plug

Model #: ML83587

Model: ML83587

View products

2″ Standard PR Pneumatic Test Ball Plug

Model #: ML83586

Model: ML83586

View products

1-1/2″ Standard PR Pneumatic Test Ball Plug

Model #: ML83585

Model: ML83585

View products

8″ Twist-Tite Mechanical Wing Nut Test Plug

Model #: ML11079

Model: ML11079

View products

6″ Twist-Tite Mechanical Wing Nut Test Plug

Model #: ML11078

Model: ML11078

View products

4″ T-Cone Cleanout Test Plug

Model #: ML10493

Model: ML10493

View products

3″ T-Cone Cleanout Test Plug

Model #: ML10492

Model: ML10492

View products

2″ T-Cone Cleanout Test Plug

Model #: ML10491

Model: ML10491

View products

1-1/2″ T-Cone Cleanout Test Plug

Model #: ML10490

Model: ML10490

View products

4″ Economy Wing Nut Test Plug

Model #: ML10489

Model: ML10489

View products

3″ Economy Wing Nut Test Plug

Model #: ML10488

Model: ML10488

View products

2″ Economy Wing Nut Test Plug

Model #: ML10487

Model: ML10487

View products

1-1/2″ Economy Wing Nut Test Plug

Model #: ML10486

Model: ML10486

View products

4″ Twist-Tite Mechanical Wing Nut Test Plug

Model #: ML10485

Model: ML10485

View products

3″ Twist-Tite Mechanical Wing Nut Test Plug

Model #: ML10484

Model: ML10484

View products

Find It Fast

Why Mainline?

Because we know the industry. Because we innovate for it. Because we adapt to it. Because we are constantly expanding our line to support your needs. Because we help you propel each project with quality products fit for a PRO.

Mainline. Preferred by the Pros.

MAINLINE COLLECTION | © 2025 EMCO CORPORATION | Cookie Preferences