Williams 9303 Extension 326070-701 A failing switch often results

A failing switch often results in ignition lockout or "pressure switch stuck open" error codes

Featuring a 1-1/8" ODF solder connection and a full 1-1/8" port size

also identified by model X22440B4B

including models like F4807

Williams 9303 Extension 326070-701 A failing switch often resultsThe Williams 9303 Extension is a professional grade 24 inch vent extension kit engineered specifically for direct vent gravity wall furnaces. This heavy duty galvanized steel vent extension is the standard solution for HVAC installers dealing with deep wall penetrations where standard venting falls short. It is designed for use with wall thicknesses ranging from 15 inches to 24 inches, ensuring a secure and code compliant flue path from the furnace to