Caps and Plugs


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Plastic grease caps for Zerk fittings

Tapered Caps & Plugs

Caps and Plugs USA components are inexpensive dual-function closures that can be used as either a plug or a cap.

Where to Buy Tapered Caps & Plugs?

Caps and Plugs USA manufactures tapered plastic caps and plugs in Southern California. Buy American-made products at factory-direct prices, with multiple sizes and samples available to help you find the right fit.

Plastic Plug Caps with Flanged Ends

Our caps and plugs with a flanged base offer an easy gripping point for installation and removal. When used as plugs, the flange helps prevent the part from being pushed too far into the opening.

Snap-on Zerk fitting caps

Plastic Plug Caps with Pull Tabs for Easy Removal

Our caps and plugs with a pull tab base provide a convenient gripping point for quick, easy removal. The tab helps you pull the part free, especially in tight or hard-to-reach spaces.

Protective grease fitting caps
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Stock and Custom Colors Available

Choose from five stock colors to help identify lubrication points and organize maintenance. Additional and custom colors are also available for larger orders, subject to minimum order quantities.

Tapered Caps and Plugs

Try Our Cap and Plugs Today

Test Any Cap and Plug Before Placing a Full Order

Sample packs are available for each and every size of our caps and plugs making sure you're getting exactly what you need before making a full purchase.

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sample boxes
Snap-on Zerk fitting caps

Available in BioMax™ Plant-Based HDPE

All caps and plugs are available in BioMax™, plant-based HDPE as a more environmentally friendly option. BioMax™ is identical to traditional HDPE in terms of performance and composition, but is derived from renewable, low carbon resources.

Local Manufacturer

Locally Made & Factory Direct

Made in USA - Factory Direct 

Our caps and plugs are manufactured at our Southern California facility and sold directly to your business. Factory-direct ordering gives you access to competitive volume pricing, multiple cap styles, and a domestic source for your ongoing supply needs. Whether you are protecting a fleet or supplying an equipment production line, compare our available configurations to find caps and plugs that suit your application.

Southern California manufacturing facility

Fast Lead Times

Keep caps and plugs on hand with convenient online ordering, shipped directly from our Southern California facility.

Affordable Shipping Rates

Order caps and plugs for your business with shipping options available at checkout.