Product Description Laars 2400-548 Gas Valve For the Endurance EBP and EDP boilers, new style and old style. A combination gas valve will work with both natural gas and liquid propane gas (LP) but both gas types must be set up by making adjustments to the air and gas mixtures utilizing a dual menometer and electronic combustion analyzer. Specs Application: Replacement Part Product Type: Gas Valve Commercial Models Summit Models SMB & SMW Sizes 200 & 250 Residential Models Endurance Models EDP EDN & EBP Sizes 110-175.