Williams 9303 Extension 326070-701 Featuring a 1-1/8" ODF solder

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

ensuring your HVAC control system receives accurate data for staging and modulation

you must replace the existing 3/8" nut for 1/4" tubing with the included 7/16" nut to ensure a leak-proof seal

ensuring a perfect fit and reliable operation in cold climates

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

Williams 9303 Extension 326070-701 Featuring a 1-1/8" ODF solderThe 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