English
Civil building piping values hygiene safety and installation convenience above all. Drinking water supply requires PVC fittings that comply with potable water hygiene standards — non-toxic materials with no harmful substance leaching. Indoor drainage systems demand fittings with smooth inner walls and good corrosion resistance to minimize fouling and noise. Key selection points: choose the SDR class of water-supply fittings according to the household water pressure; pay attention to slope and ventilation design for drainage; ensure elbows, tees and traps are available in complete sizes with tight socket fit. Never mix water-supply and drainage fittings — their pressure classes and hygiene requirements are completely different. Project acceptance usually checks hygiene approval certificates and pressure test records, so purchasing fittings supplied with test reports is recommended to secure compliance from the start.
