M18x1.5 O2 Sensor Extender 32mm – HHO & Test Pipe (10-Pk)

Bulk O2 Sensor Extenders for HHO Setups, Test Pipes & Tuning

This 10-pack gives you a stack of simple, reliable O2 sensor spacers built to the standard M18x1.5 thread — the size used on the vast majority of oxygen sensor bungs. They’re a straightforward way to relocate your O2 sensor slightly out of the direct exhaust stream, which is exactly what’s needed when running a test pipe, an HHO system, or when leaning out the air-fuel mixture for better fuel economy.

Unlike catalytic-converter-style spacers, these are a plain extender — no built-in catalyst core, no emissions-passing claims. They’re a mechanical adapter, nothing more, which keeps them simple, affordable, and easy to stock up on if you’re running a shop or working on multiple vehicles.

Why Buy in a 10-Pack

If you’re a mechanic, tuner, or off-road builder working across multiple vehicles, buying single extenders one at a time adds up fast. This pack keeps a supply on hand for whichever job comes up next — inline engines, V6/V8 setups, or spares for future installs.

Easy to Install

The 7/8″ hex head matches the shape of most O2 sensors, so it seats and tightens like a natural extension of the sensor itself — no fumbling with a straight-sided piece that won’t grip a wrench properly.

1. Unscrew the existing O2 sensor from the exhaust.
2. Thread the sensor into the extender.
3. Screw the assembled piece back into the exhaust bung.

That’s the whole process — no cutting, welding, or special tools required.

Specifications

Important Notes

• This is a mechanical spacer, not a catalytic converter — it does not chemically treat exhaust gases.
• Intended for off-road, test-pipe, and HHO-system applications. Not intended as an emissions-compliance device for street use.
• Confirm your vehicle uses a standard M18x1.5 O2 sensor bung before ordering.