The elbows, tees, reducing tees and end caps we manufacture are produced and tested according to the standard specifications for manufacturing fittings of welded polyethylene plastic pipes. Very specific requirements are put forward for fabricated pipe fittings in two aspects-HDPE pipes, types of fittings, and plates or plates used to manufacture rated pressure fabricated pipe fittings; and the tests required for qualified fabricated fittings. Click to buy Hdpe Pipe Accessories.