Thread: "UNF" (Fine thread) type are straight, non-sealing threads that rely on an o-ring to provide a seal. "NPT" (Pipe thread) type are tapered thread that seal as they are tightened. Measure the O.D. of the thread on the valve you are replacing and compare to the thread specifications table to determine the correct thread size. Locking: Valve locks in the open position for easy draining. Flush mounted: Valve is designed to mount flush with aircraft skin. Use Pin Type Cup: Pin type cups similar to MCCCA-39680 may be used with indicated valves for sampling fuel. Open Action: "Spiral" valves require a push and turn action to open. "Push" valves require a push action to open. Hose Adapter Size: A hose may be attached to the valve for ease of draining fuel. The size is the hose I.D.
Curtis Superior Fuel Quick Drain Valves
Curtis Superior Valve Co. Inc. has produced, engineered, manufactured, and tested aircraft valves to exacting standards since 1944. They have many standard valves to solve a wide range of problems.
Corrosion resistant, stainless steel springs
Specially compounded "cure dated" synthetic rubber seals to withstand a wide variety of liquids over a broad temperature range