This document covers plumbing waste fittings of sizes NPS-2 and smaller. It does not cover (a) plumbing supply fittings, which are covered by ASME A112.18.1/CSA B125.1; other devices (e.g., temperature-actuated in-line mixing valves), which are covered by CSA B125.3 or other plumbing product standards; and flexible water connectors under continuous pressure, which are covered by ASME A112.18.6/ CSA B125.6. It also does not cover pipes and tubes or pipe and tube fittings that are downstream of the trap.