The Pentair 274494 O-Ring Valve Adapter is a critical component that ensures a safe and leak-free connection in HVAC systems. This black O-Ring Valve Adapter is made of premium rubber and is designed to fit between valves and other system components, sealing the gap tightly. It keeps the system reliable and efficient by squeezing against the mating surfaces to stop fluids or gases fro... https://www.usapoolshop.com/274494-pentair-o-ring-valve-adapter