NEOPERL check valves are 100% tested to provide durable drip-tight operation, the company notes. Sizes range between 1/4" and 2” for applications up to 200?F and 260 psi. Select models include a pressure-compensating flow regulator (0.5 to 4 gpm). All units are ANSI/NSF 61-372 certified, and several have ASME A112.18.3M certification.WWW.NEOPERL.COM