Aluminum Hose Couplings CQT-1:Cast iron Hose Coupling, to fit Hose O.D. 38mm (1-1/2") CQT-2: Cast iron Hose Coupling, to fit Hose O.D. 48mm (1-7/8") CQT-2L: Cast iron Hose Coupling, to fit Hose O.D. 48mm (1-7/8"), long type: 125mm CQT-3: Cast iron Hose Coupling, to fit Hose O.D. 55mm (2-3/16") STC-1/BSP: Cast iron threaded claw Coupling, Angle claw, 1-1/4"B.S.P. thread STC-2/BSP: Cast iron threaded claw Coupling, Angle claw, 1-1/2"B.S.P. thread