Certified to ASSE Standard 1003 and CSA Standard B356. Listed by IAPMO and ASSE and certified lead free complying with NSF 372.Modular Cartridge Design reduces the number of parts requiring service.Compact pressure reducing and regulating valves.This regulator is suited for either cold or hot (to 180?F) water service.Every valve is tested for performance prior to shipping. Assembled and tested in the USA.