DU-BRO Bolt-On Pressure Fitting – Muffler & Crankcase Pressure Tap

The DU-BRO Bolt-On Pressure Fitting provides a simple and reliable way to add a pressure tap to your RC engine’s muffler or crankcase. This fitting helps supply steady fuel tank pressure, giving your engine smoother fuel delivery, more consistent tuning, and better overall performance. Whether you are flying glow or gas engines, this small but essential part keeps your fuel system working at its best.

Each fitting includes a brass pressure nipple, a fiber sealing washer, and—on the #241 version—a mounting nut for easy installation. You can install the fitting by either drilling and tapping the correct size hole in your muffler/crankcase, or by using the included nut (model #241 only) to secure it from the inside. Installation is quick, clean, and dependable.

DU-BRO offers three versions to match the tubing size used on your model:

• #241 – Recommended for 1/8" tubing, includes mounting nut

• #539 – For 5/32" tubing

• #540 – For 5/32" tubing

All versions weigh only 1 gram, making them incredibly lightweight while still delivering strong, leak-free performance.

These pressure fittings are perfect for glow engines, gas engines, and any model that requires reliable tank pressurization—especially sport planes, scale aircraft, and high-performance setups.

Proudly Made in the USA, the DU-BRO Bolt-On Pressure Fitting is a small upgrade that makes a big difference in engine consistency and fuel system reliability.