Manufacturer Name: Maxitrol Product Number: R400S-1/2 OEM Part Number: R400S-1/2 Product Description: 1/2" Gas Pressure Regulator 300000 Btu Use With R400b10 Spring Comes Standard W/ Weight:1lbs/453.59g Looking For The Best Prices On Oem/Replacement Part# R400S-1/2 1/2 Inch Regulator 5#In 3-8 Inch Springout For Maxitrol You've come to the right place. Shop at PartsHnC with same... https://www.partshnc.com/r400s-12-maxitrol-12--gas-pressure-regulator-300000-btu-use-with-r400b10-spring-comes-standard-w