This 4" (102mm) Snap style grooved end pipe coupling is made of cast 304 stainless steel and supplied with a 4" nitrile buna grooved end pipe coupling gasket. It is rated to 300 psi and is a simple style of coupling that is designed for quick disconnect service. Mated housings are hinged with an attached, locking handle for assembly. These couplings are built to withstand harsh environments for long periods of time, but they should be inspected periodically and replaced when needed.