Barb Dia.(Fit Hose ID): 10mm x 8mm x 8mm (3/8" x 5/16"x 5/16"); Angle: 120 Degrees; Total Size: 46mm x 40mm / 1.81" x 1.57"(L*H) This coupling has barbed connections on each end for connecting three hoses with the different diameter in a straight run.