Valvesonly Europe is the Top quality Pressure Relief Valve supplier in Europe. Description: Body: Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel Diaphragm: EPDM , NBR Disc: Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel Pilot Valve: Stainless Steel, Brass Spring: SS304 Shaft: SS304 Working Pressure: PN1.6, PN2.5, PN4.0 https://www.valvesonlyeurope.com/product/pressure-relief-valve/