Type: Flanged Duckbill Check Valve, Slip on Duckbill Check Valve Size: DN50-DN1800 Rubber Material: EPDM, NBR, NR, CR, CSM, FKM etc. End Connection: Slip on/Flange Flange/ Clamp material: Galvanized Steel, AISI304 or AISI316 Flange Drilling: EN1092 PN10, PN16; AS2129 Table D/ E, ANSI B16.10 Class 150# etc. Pressure: PN10, PN16 Curved Bill, flat bottom is also available For more detail information kindly come to worgocn dot com or contact us sales at worgocn dot com freely. -