90 deg socket weld elbows are belong to ASME B16.11 stainless steel pipe fittings.SW elbows have two types:90 DEG and 45 DEG.SW pipe fittings including:Elbow, Tee, Cross, Coupling, Union, Cap, Reducing Insert, Sockolet.Three pressures for customers to choose:3000LB,6000LB,9000LB.