Fittings & Plugs

Need a transition between two thread types, or does a sensor need a fixed mounting point in a pipe? This category contains fittings, adapters, plugs and weld-on sensor bungs as well as muffler end caps for you if you are building or modifying the fuel, fluid or exhaust system in your project.

Thread types and connections

Most fittings here use AN, NPT or ORB connections. AN fittings typically seal on a conical flare, NPT is a tapered pipe thread that seals in the thread itself, and ORB seals with an O-ring against a flat surface. From Radium Engineering you will find, for example, adapters from 10AN ORB to 6AN male, 90-degree fittings in 1/8in NPT and banjo fittings with a swivel connection. More variants are available under fittings and adapters.

How to choose fittings and plugs

• Thread and size: Check both the thread type and the size of the component you are screwing into. A 1/8in NPT thread and a 10AN ORB thread cannot replace each other.
• Angle: Whether you need straight or angled fittings depends on how the hose needs to be routed and how much space is available.
• Material: The choice depends on fluid, temperature and weight. Sensor bungs are available, for example, in stainless steel from Stainless Bros and in titanium from Ticon Industries.
• Hose connection: The AN male end or hose barb must match the hose and tubing you are using.

With sensor bungs you should also consider the pipe diameter; a coped end shaped to the curvature of the pipe can make fitment before welding easier.

Installation and sealing

NPT threads typically require thread sealant, while AN and ORB connections are normally installed without it, because sealing takes place on the flare or O-ring. Tighten according to the manufacturer's instructions, as overtightening can damage the sealing surface, especially in aluminium. Check the connections for leaks after the first drive and during regular inspections. For securing lines there are hose clamps and brackets, and complete solutions can be found under fuel system kits. The category also includes brands such as Vibrant, Russell, Fragola and DeatschWerks.

Frequently asked questions

What is the difference between AN, NPT and ORB fittings?

AN fittings typically seal on a conical flare, NPT seals in the tapered thread, and ORB seals with an O-ring against a flat surface. The right type depends on the component you need to connect.

Do I need to use thread sealant on my fittings?

Thread sealant is typically used on NPT threads. AN and ORB connections normally seal on the flare or O-ring and are generally installed without it. Always follow the manufacturer's instructions for the specific product.

What should I look out for with a weld-on sensor bung?

Check that the bung matches the pipe diameter and the sensor thread, e.g. 3/8in NPT. The material should typically match the pipe, so titanium is welded to titanium and stainless steel to stainless steel.

Can I combine fittings from different brands?

This is typically possible when thread type, size and sealing principle are the same. However, always check the specifications for both parts before installing so the connection seals correctly.