Barb Dia: 8mm to 4mm; Barb Length(Approx.): 20mm / 0.79"; 15mm / 0.59"; Total Size: 33mm x 28mm x 9.5mm /1.3" x 1.1" x 0.37"(L*H*T) This coupling has barbed connections on both ends for connecting two hoses at an angle.