ASSE (Plumbing) 1066-1997

This standard applies to automatic pressure balancing in-line valves which are used to equalize incoming hot and cold water line pressures for the purpose of minimizing mixed water temperature variations due to pressure fluctuations when used in conjunction with a mixing valve or two handle valve set. They are not designed to limit the maximum outlet temperature at the point-of-use. These devices are intended for use in individual plumbing fixtures fittings such as shower heads, bath utility faucets, and sink and lavatory faucets.