Williams 9303 Extension 318973-401 This specific part number is

This specific part number is a complete assembly

this replacement door assembly provides a robust barrier against UV radiation and harsh environmental conditions that can degrade sensitive control interfaces

With a 3-inch insertion depth and standard quick-connect terminals

5" 150 PSI steam relief performance

Williams 9303 Extension 318973-401 This specific part number isThe 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