COB Industries, Inc. has been producing and distributing Pipe Plugs for all types of applications for over 30 years. Over the years the Pipe Plug division has grown into an extensive product line with plugs for almost any application including Low Pressure Expansion Plugs, FME(Foreign Material Exclusion), Multi-Size Inflatable and Bypass Plugs from 2” – 96”, High Pressure Test Plugs, Qwik-Sealfast Self-Restraining Plugs, Chemical Resistance Plugs and much more. View the new complete Pipe Plug Brochure to find the right products for your applications. COB Industries stocks an impressive amount of these products on the shelves of a newly expanded production and warehouse facility and has a dedicated and efficient shipping department committed to delivering these products as soon as possible to meet needs of energy, power generation, water and sewer and construction industries.


Low Pressure Nylon Expansion Plugs Durable multi-purpose pipe plugs / tube plugs for weld purging, low pressure testing, leak testing, simple closures and other pipe plugging applications.		Cast Aluminum Expansion Plugs Rugged, lightweight aluminum expansion plugs from 1.5” – 36” (custom sizes also available). These are easy to use wing-nut style pipe plugs with a hollow threaded stem that can be used to fill or vent. Sometimes referred to as “plumber’s plugs”, they are used in a wide range of applications including water and sewer, petroleum and gas, construction and FME (foreign material exclusion).

Pipe Plug Kit Nylon Expansion Plugs from 1/2” – 4” with fittings and caps in a convenient hard carrying case with custom foam inserts. Ideal for pipe purging, automotive radiator and swimming pool testing.		Low Pressure Expansion Plugs Fast and easy low pressure expansion plugs provide watertight seals in a variety of styles including Snap-Tite Plugs, Turn-Tite Plugs, Hex-Nut Plugs and Thumb-Nut Plugs.

Bag Plugs Bag Plugs are widely used in power plants and all kinds of piping systems for FME (foreign material exclusion) applications, to prevent debris from entering a line or to block gas or fumes. These heavy-duty inflatable plugs can be inserted through smaller diameter openings and seal pipe from 2” – 96”.		Qwik-Fit Cylinder Plugs Qwik-Fit Cylinder Plugs are similar to the Bag Plugs in that they can fit through reduced openings, but they are an elongated (cylindrical) version that can also hold small to moderate amounts of water pressure in addition to FME applications.

Qwik-Gate Plugs Used for valve replacements, to add fittings or make line repairs without having to shut off water or drain lines. Qwik-Gate Plugs can withstand from -25°F to 225°F and are rated for up to 65 PSI.		OLS Plugs Tough, versatile multi-size inflatable pipe plugs / flow stoppers made from Kevlar-reinforced neoprene rubber that can hold roughly 10 PSI – 30PSI backpressure. Available for pipe sizes from 1.5” – 48”.

Flex ODS Plugs Multi-size inflatable pipe plug / flow stoppers made from Kevlar-reinforced neoprene rubber with a built-in, threaded bypass which allows for filling or venting through the plug. Available from 4” – 48”.		Mega Plug Giant versions of the Flex-ODS Multi-Size Bypass Plugs that cover pipe sizes from 20” – 96” diameters. Come with separate bypass and pressure test connections.

Qwik-Test Seal Plugs These are commonly called Disc Plugs and have a low-profile aluminum body with an inflatable seal and 2” test ports with a braced pressure rating of 15 PSI. Disc Plugs can be made either in one piece or in multiple sections for limited access situations (all sizes 48” and up are “split design). Sizes 24” – 96”		Medium Pressure Roll-up Size specific inflatable test plugs with a braced pressure rating of up to 150 PSI with bypass and vent ports standard. Sizes 4” – 96”

Qwik-Sealfast Plugs Self-restraining pipe plugs made to order for all kinds of pipe testing and pipe plugging applications that can be rated for up to 250 PSI backpressure. Sealfast Plugs are available with inflatable or mechanical seals for sizes 4” and up.		Qwik-High Pressure Stopper High Pressure Mechanical Test Plugs rated for pressure testing up to 3000 PSI. Available to fit all pipe schedules from 1/2" and up with connection for filling / venting.

Qwik-Socket Weld Plugs Designed for pressure testing socket weld fittings, Socket Weld Plugs eliminate the need for welding plugs or nipples to openings for testing. Available from 1/2" – 2”.		Qwik-High Pressure External Closure External Closures offer a very safe method of pressure testing—as pressure increases the clamp forms a tighter seal. These are also used in applications where the ID of the pipe cannot be marred. This method is an industry proven performer available for up to 12” pipe.
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Grout Packers Multi-size Grout Packers are now available in a variety of sizes and lengths that are rugged and easy to use.		Custom Manufactured Plugs Our Custom Plug division can design and engineer almost any plug for any application. From test plugs to joint testers to giant, ROV-friendly flange plugs for offshore platforms, our experienced team can produce whatever is needed to get the job done.

In addition to the full range of standard Pipe Plugs, our Custom Plugs section offers a team of experienced experts in the industry with the unique ability to design, engineer and manufacture a solution for just about any type of custom application or need. This includes Joint Testers for pressure testing and all kinds of Self-Restraining Plugs for almost any diameter or pressure requirement. COB Industries also supplies the oil and gas industry with Custom ROV / Flange Plugs designed for ROV operations and installation on offshore platforms. Contact us to speak with one of our experienced staff to discuss any specific application or requirement.