... . 3.Professional service. 4.DN2"-DN48" . 5.rubber seat rubber seat with resin back ringrubber valve seatMaterials:Rubber Seat Material: NBR,EPDM,NR,CR,SI,FPM ... mouldingpowder, Aluminum and FRP etc.Order Notes:This is fit for reference, customer must tell names,thickness,temperature,pressure in order ...