258-02011C | MT Series 2W Valve Assy, ANSI 250, NC, Mod Eq Pct, 1/2", FxUM, 4 Cv, 8-13psi SR | Siemens Connection Type_Female SAE Threaded The A421 controls are available Size_4X4-1/2 Rectangular Damper 20X22 ND G780DS-250+AFX24-MFT-S-X1
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