NEOPERL check valves are auto-assembled and 100% tested to provide a durable drip-tight operation. Sizes range between 1/4 inch and 2 inches for applications up to 200° F and 260 psi. Select models come combined with a pressure compensating flow regulator (0.5 to 4 gpm). All units are certified to ANSI/NSF 61-372 and several have ASME A112.18.3M certification.