Turbosmart's Diaphragm Assembly Plus Valve Guide O-ring is designed to provide superior sealing and durability for Turbosmart ProGate50 (50mm) and PowerGate60 (60mm) External Wastegates, as well as the discontinued 6-bolt WG38/45. This premium quality diaphragm assembly boasts a large diameter seal for maximum sealing at higher boost levels, while its valve guide o-ring ensures leak-free operation. Turbosmart's Diaphragm Assembly Plus Valve Guide O-ring is a must-have item for your Turbosmart external wastegate setup! Installing this high-quality Turbosmart product will ensure you get reliable performance time after time. Get Turbosmart's Diaphragm Assembly Plus Valve Guide O-ring today and get the most out of your Turbosmart external wastegate setup!