美女又黄又免费的视频,久久aⅴ无码av高潮av喷吹,精品美女国产互换人妻,聂小雨一战三视频精彩回顾,国产精品爆乳尤物99精品

15

2022

-

03

What is the specification of the soft water pipe


Soft water pipe is a new type of pipe with inverted filter permeability (drainage). It has the following advantages: 1. small pore diameter, all-round water permeability, good permeability. 2. high compressive and tensile strength, long service life.

Soft water pipe is the latest soft water pipe material today, can be used for heating pipes, refrigeration pipes, non-toxic environmental protection, pipe volume is small, light weight, corrosion resistance, pressure resistance, ageing resistance, use for a long time will not form dirt in the inner wall of the pipe, but the only disadvantage can not withstand high temperature, pressure resistance is poor.