Plugs and Caps

• AN ORB plugs: Round internal hex plugs for blanking off unused AN ORB ports.
• NPT plugs: Round internal hex plugs for blanking off unused NPT ports.
• AN caps: Caps that close off male AN fittings.
• Replacement O-rings: Viton O-ring 5 packs for servicing AN ORB fittings.

Related categories: AN Fittings, Adapter Fittings, Quick Connect Fittings, Hose Ends, Bulkhead Fittings, Banjo Fittings and Check Valves. See all brands on our brands page.

• Thread type: First confirm whether the port is AN ORB or NPT. These are different thread standards and are not interchangeable.
• Size: Match the plug or cap to the port or fitting size, for example 6AN for AN fittings.
• Male or female: Plugs close off female ports. Caps close off male fittings.
• Servicing ORB fittings: Replacement Viton O-rings are available for AN ORB fittings.

All products in this collection are universal. Check the size and thread on each product listing before ordering.

Installation by a professional is recommended. Round internal hex plugs are tightened with a hex key that suits the plug. When servicing AN ORB fittings, it is good practice to have replacement Viton O-rings on hand. Always confirm the thread type and size before fitting a plug or cap to a fuel, oil or other fluid system.

What are plugs and caps used for?
They blank off unused ports and fittings, for example when a component has more ports than your system needs.

What is the difference between a plug and a cap?
A plug goes into a female port. A cap goes over a male fitting.

Can I use an NPT plug in an AN ORB port?
No. AN ORB and NPT are different thread types, so choose the plug that matches the port.

Do you sell replacement O-rings for AN ORB fittings?
Yes. Radium Engineering AN ORB Fitting Replacement Viton O-Ring 5 Packs are available in this collection.