The C500 is used on the bladder style wing tanks with a 1/2” diameter nozzle.
The P3750 has a 3/8” NPT thread and is designed for use on those applications. Both valves provide push-to-test or push-and-twist features for locking the valve open. Material is 360 brass.
The SA5817-4C is used with a 3/4”-16 bulkhead fitting to mount the valve flush with the outside skin of the plane. A hose is attached to the valve with a 7/16”-20 fitting at the low point of the fuel system. Material is anodized aluminum.
The SA-60S valve is the same as the CAV-160 except it is constructed of 304 stainless steel. The valve can be used in highly corrosive applications such as salt water.
The 4350-6L has a 7/16”-20 thread and a long stem that can be cut to length for your application. Material is anodized aluminum.