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Plastic & Rubber Plugs / Stoppers

Rubber Stoppers / Plugs

At the heart of the StockCap line of plastic and rubber stoppers (plugs) is the  tapered plugs. With a large number of sizes in stock, there is a stopper to fit every tube or pipe. Diameters range from as small as 0.100 inch up to 5.00 inches (on the small end). Sizes vary by material type. Click the images below to view the charts of available sizes. EPDM and high temperature resistant silicone function in a wide variety of applications. View our Material Selection Guide for details.

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EPDM Rubber Stoppers   Silicone Rubber Stoppers

Additional Rubber Plugs

Beyond the traditional Tapered Plugs, are Pull Plugs available in both EPDM and Silicone materials. The unique trait of the pull plug is activated when pulled through a hole, stretching it so as it is released it tightens and secures the seal. Later, when its service is complete, another pull stretches it, reducing the friction and allowing it to be removed. These pull plugs are re-useable in some situations. View our Material Selection Guide for details.

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EPDM Pull Plugs   Silicone Pull Plugs

Plastic Stoppers

Plastic stoppers offer a cost effective alternative to rubber stoppers for some applications. In particular, our vinyl plus plugs have a lot of the same characteristics as the rubber stoppers in terms of flexibility and the seal that they provide. Our plastic T-Plugs also function great as protectors against dust or particle contamination.

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See all plug styles, rubber plugs, and more, in our Plugs section.

To request a sample or pricing on any of our protective pipe caps or plugs, please visit the product page or click below.

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