3/4" MT-40 Weld Outlet Fittings Female Thread Welding Branch Connection MT-40 Weld Outlets: MT-40 Weld Outlet Fittings provide a threaded outlet branch connection. Fittings are forged steel per ASTM A-105 and are available in outlet sizes 1/2" - 2" for 1 1/4" - 8" run sizes. May be installed on all schedules of steel pipe. Each outlet size requires only one hole size, minimizing hole saws / drills needed for installation. Threads comply with ANSI / ASME B1.20.1 for NPT. Fittings are contoured to provide a precise fit at the opening in the run pipe and conforms to standard practice MSS SP-97. All fittings are UL/ULC listed and all fittings except 1 1/4 x 1 1/4, 1 1/2 x 1 1/2 and 2 x 2 are FM approved for use in fire protection systems at 175 PSI for Schedule 5 pipe and 300 PSI for Schedule 7 pipe and above.