PP-R environmental protection/ Dark valve

◎住宅(zhai)建筑內冷(leng)(leng)熱(re)水(shui)(shui)(shui)(shui)用(yong)(yong)管(guan)◎凈(jing)水(shui)(shui)(shui)(shui)、純水(shui)(shui)(shui)(shui)輸送(song)用(yong)(yong)管(guan)◎熱(re)水(shui)(shui)(shui)(shui)循環(huan)與(yu)供熱(re)采暖用(yong)(yong)管(guan)◎自來水(shui)(shui)(shui)(shui)配管(guan)◎養殖業用(yong)(yong)管(guan)◎水(shui)(shui)(shui)(shui)處理用(yong)(yong)管(guan)◎食品、飲料、藥(yao)物工廠輸水(shui)(shui)(shui)(shui)用(yong)(yong)管(guan)◎工業冷(leng)(leng)熱(re)水(shui)(shui)(shui)(shui)輸水(shui)(shui)(shui)(shui)管(guan)◎中央空(kong)調冷(leng)(leng)凝水(shui)(shui)(shui)(shui)輸送(song)◎壓縮空(kong)氣用(yong)(yong)管(guan)