Neoperl check valves are auto-assembled and 100% tested to provide durable drip-tight operation. Sizes range between 1/4” and 2” 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.