Our fabricated elbows, tees, reducing tees, and end caps are produced and tested in accordance with ASTM F2206 – “Standard Specification for Fabricated Fittings of Butt-Fused Polyethylene Plastic Pipe.” ASTM F2206 places very specific requirements on fabricated fittings in two areas – the type of HDPE pipe, fittings, and plate or sheet stock used in the manufacturing of pressure-rated fabricated fittings; and the testing required for qualifying fabricated fittings.