PN 10. Nickel plated brass construction UNE-EN 12165. EPDM perox diaphragm. Zinc plated steel spring EN 10270. Gas threaded ends (BSP) M -ISO 228/1. Maximum working temperarue 90ºC. The “STOP-GE” water hammer damper has been designed to attenuate the “water hammer” phenomenon which is created in a closed conduct when there is an abrupt variation in the fluid speed.