管道连接密封 meaning in English

sealing for tubing joints

Elastomeric seals - material requirements for pipe joint seals used in water and drainage applications - part 2 : thermoplastic elastomers ; german version en 681 - 2 : 2000 a1 : 2002
弹性体密封件.给排水用管道连接密封件的材料要求.第2
Elastomeric seals - materials requirements for pipe joint seals used in water and drainage applications - part 4 : cast polyurethane sealing elements ; german version en 681 - 4 : 2000 a1 : 2002
弹性体密封件.给排水用管道连接密封件的材料要求.第4