... 50 years 4.Easy and quick instal HDPE male thread joint 1.As a company listed in Singapore , ... fuel gas, etc. 2.Detail: Name:HDPE male thread joint SpecificationOutside diameter(mm):20*1/2",25*3 ... and alkali corrosion;High impact strength and mechanical intensity;No jam-up and sediment, smooth internal wall , ... than cast iron pipes of the same diameter;No rust, so keep external wall un-contaminated by ...