Aluminum Elbow Coupler x Adapter 45 Degree are available in ID sizes 2", 3", 4" and 6", Aluminum Elbow Coupler x Adapter 90 Degree are available in 1 ", 2", 3", 4 and 6", Aluminum Elbow Coupler x Hose Shank 90 Degree are available in ID sizes 1 ", 2", 3", 4" and 6", Aluminum Elbow Coupler x Coupler 90 Degree are available in 2", 3", 4" and 6"ID sizes.