“三环”牌HDPE给水管材、管件;HDPE双壁波纹管;HDPE燃气管;HDPE矿用管;HDPE钢丝网复合给水管;PP-R冷热水用管材、管件;PVC-U排水管材、管件;PVC-U绝缘电工套管和精品家装用...