Fuelab Diaphragm & O-Ring Kit for 515xx/525xx Series Regulators - Large Seat

This diaphragm and O-ring kit from Fuelab is specifically made for their 515xx and 525xx series fuel pressure regulators that use a large seat. The diaphragm is a critical component that separates the fuel chamber from the control spring, and its condition directly impacts how accurately your regulator holds pressure. Over time, diaphragms can become stiff or brittle, leading to inconsistent fuel pressure or even leaks.

This kit includes the necessary O-rings to ensure a proper seal when you replace the diaphragm. Using the correct, well-made replacement parts like these from Fuelab is important for maintaining the performance and reliability of your fuel system. It’s a straightforward way to service your regulator and get it back to performing as it should.