Drain tubes are special alloy, flanged 90 deg one end and function as drain for transom, motor well, livewell or baitwell. Wall thickness is .035”. MOE 21002188D Alum OD 1” Length 1 7/8” MOE 21003188D Brass OD 1” Length 1 7/8” MOE 21003300D Brass OD 1” Length 3” MOE 21253300D Brass OD 1 1/4 ” Length 3” Flanging tool for 1” drain tub MOE2070000 for 1 1/4” tubes MOE2070400