The Lochinvar gasket is designed for compatible EnergyRite and 2 inch ASME flange applications where a dependable seal is needed at the flange connection. A gasket is useful because it helps create a barrier against leaks, supporting cleaner installation and more dependable heater performance.This replacement is especially useful when the original gasket is flattened, cracked, brittle, worn, or leaking. Matching the correct thick 2 inch flange design helps preserve intended fit and dependable sealing support.The 100208100 is a practical service part when a compatible Lochinvar heater needs a gasket to restore dependable flange sealing. Lochinvar flange gasket Fits compatible EnergyRite and ASME applications 2 inch thick flange design Useful when the original gasket is worn or leaking Supports cleaner and more dependable heater performance