NEOPERL releases plastic cartridge check valves that are preassembled and provide a durable drip-tight operation, the company notes. The units are available in 12 sizes between 3/8” and 2” for applications up to 200° F and 230 psi. Selected models (CV14FR and CV15FR) come combined with a pressure-compensating flow regulator (0.5 to 4 gpm). All units are certified to ANSI/NSF 61 standards.