Iron body construction. Bronze body option available in some sizes. Brass seat, silicone seat disc and EP diaphragm. “Pop” type opening action. The F-95 Valve series offers a complete line of boiler safety relief valves in sizes ranging from 3/4" X 1" to 2" X 2-1/2". This complete range of sizes provides pressure protection for many commercial/industrial OEM boilers and hot water heating system applications. 30 to 75 psi pressure sets available.