This is the fourth edition of ASME A112.18.1/CSA B125.1, Plumbing supply fittings. It supersedes the previous edition published in 2012. Together with ASME A112.18.2/CSA B125.2, Plumbing waste fittings, CSA B125.3, Plumbing fittings, and ASME A112.18.6/CSA B125.6, Flexible water connectors, this Standard forms a series to cover plumbing fittings. This Standard covers plumbing supply fittings and accessories located between the supply stop and the terminal fitting, inclusive, as follows: a) automatic compensating valves for individual wall-mounted showering systems; b) bath and shower supply fittings; c) bidet supply fittings; d) clothes washer supply fittings; e) commercial pre-rinse spray valves; f) drinking fountain supply fittings; g) humidifier supply stops; h) kitchen, sink, and lavatory supply fittings; i) laundry tub supply fittings; j) lawn and sediment faucets; k) low-pressure water dispensers; l) metering and self-closing supply fittings; m) showerheads, hand-held showers, and body sprays; and n) supply stops.