Siemens 257-02040 MT SERIES 2W VALVE ASY, ANSI 250, NO, MOD EQ PCT, 1/2" AFXUM, 2.5 CV, 3-8PSI SRSiemens 257 02040 MT Series 2W Valve Asy, ANSI 250, NO, Mod Eq Pct, 1 2" AFxUM, 2. 5 Cv, 3 8psi SRThis Valve Assembly is a Powermite 599 MT Series, ANSI Class 250, 2 W, NO, Modified Eq Pct, 2. 5 Cv, AFxUM, 1 2", Bronze Body, Includes MT Series 2 In Pneumatic Actuator with 3 8 psi SR, Used for control of hot or chilled water for convectors This Valve Assembly is a Powermite 599 MT Series, ANSI Class 250, 2 W, NO, Modified Eq Pct, 2. 5 Cv, AFxUM, 1 2",