This gasket is commonly used in Lochinvar Knight (KBN

To maintain the UL certification and safety profile of the furnace

and mineral oils

018" diameter aperture

System Integrity: Restores the metal-to-metal or soft-seated seal integrity required for accurate hydronic heating control

White-Rodgers 90-291Q Fan Relay This gasket is commonly usedThe White Rodgers 90 291Q is a technical grade HVAC fan relay designed for switching single or two speed fan motors, solenoids, and resistive loads in commercial and residential systems. As a Type 84 enclosed relay, it features a Single Pole Normally Open (SPNO) configuration, making it a standard choice for 120V fan relay replacements where reliability is non negotiable. The 120V AC coil operates at a nominal 25 mA with a DC resistance of 2,000 Ohms,