| 2. | Standard specification for mechanical couplings using thermoplastic elastomeric gaskets for joining drain , waste , and vent , sewer , sanitary , and storm plumbing systems for above and below ground use 地下和地上用的连接排水废物通风污水卫生及暴雨管件设备的带热塑弹性垫圈的机械连接件的标准规范 |