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FM UL Grooved Butterfly Valve with Signal Tamper Switch 300psi Working Pressure/Wafer/Lug/Swing/Grooved End Flanged Type Cast Iron/Stainless Steel Butterfly, Find Details and Price about Valve Groove Butterfly Valve from FM UL Grooved Butterfly Valve with Signal Tamper Switch 300psi Working Pressure/Wafer/Lug/Swing/Grooved End Flanged Type Cast Iron/Stainless Steel Butterfly - Tianjin Ots Valve Manufacturing Co., Ltd.