For thin wall drain and sewer pipe (ASTM 2729) and SDR-35 drain and sewer pipe (ASTM 3033 and D3034). Used to change direction in piping. Sometimes called an eighth bend.
3/8 or 1/2 Pex Bend Support
5/16 Brass Barb Splicer
3/8 MIP Barb Elbow
1-1/2 Tailpiece Washer