This Valve is a Powermite 599 MT Series, ANSI Class 250, 3 W, Mix, Linear, 0.4 Cv, F×F, 1 2", Bronze Body, Brass Trim Elemento_RTD Ni1000 Wet Wet Differential Pressure 5 valve manifold Rango de Presion:0 a 1" w.c. Wet Wet Differential Pressure 5 valve manifold 0 150PSID 10V Used With W957F Economizer Tors In Parallel From A W973 Controller ANSI Class 250 Brass Trim