Siemens 172M-10321S 2W 1-1/4", 100CV BALL VALVE ASSY, STAINLESS STEEL BALL, STEM, 2-POS, NC, SRSiemens 172M 10321S This 599 Series 2 way ball valve with a 120V, 2 position control, normally closed, fail safe actuator assembly, providing 200 psi close off, is used to control hot or chilled water and up to 50% Glycol solution in convectors, fan coil units, unit conditioners, radiation and reheat coils. This 1 1 4 inch valve is 100 Cv, full port valve without flow characterizer insert, with stainless steel ball and stem, and an operating handle