Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels - metal fittings for pipes of nominal outside diameter greater than 63mm 燃气用聚乙烯管道系统的机械式管件.标称外径大于63mm的管道用金属管件
2.
Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels - metal fittings for pipes of nominal outside diameter less than or equal to 63mm 燃气用聚乙烯管道系统的机械管件.标称外径小于或等于63mm的管道用金属管件
3.
Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels - thermoplastic fittings for pipes of nominal outside diameter less than or equal to 63mm 燃气用聚乙烯管道系统的机械式管件.标称外径小于或等于63mm的管道用热塑性塑料管件
