Is this O-ring compatible with modern refrigerants

What are the symptoms of a failing commercial thermostat

Universal Versatility: Serves as a direct replacement for Honeywell Q313A1055/U and various OEM millivolt generators

25 PSI sequencing: Designed for exact calibration in multi-valve configurations

and the unit must be replaced

Lennox 17F15 Gasket 340155-7026 Is this O-ring compatible withThe Lennox 17F15 Gasket Replacement Kit is an essential OEM component designed for high performance sealing in various Lennox furnace and HVAC applications. This kit features a 10x20 sheet of durable, white fiberglass material, engineered to withstand the thermal stresses and high heat environments common in modern heat exchanger assemblies. Whether you are performing a routine inspection or replacing a degraded furnace gasket, using genuine Lennox