Water supply and drainage system: the water supply and drainagepiping from the joint at 1m from the workshop outside wall to water users.
供、排水系统:从车间外墙外1米处的接点至用水设备的供水、排水管道。
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Plastics piping systems for underground drainage and sewerage under pressure. glass - reinforced thermosetting plastics based on unsaturated polyester resin. part 3: fittings.
Plastics piping systems for buried and above-ground drainage and sewerage under pressure - Unplasticized poly (vinyl chloride) (PVC-U) - Part 1: specifications for piping components and the system.