Use this furnace air pressure switch to resolve common "3-flash" or "pressure switch stuck open" error codes during seasonal maintenance

Seamless Integration: Direct drop-in replacement for obsolete part number 5H73591-8 simplifies field repairs

visible carbon buildup or pitting on the contacts

Whether you are dealing with a G40 or G43 series unit

This often indicates a fouled seat disc or a cracked float

Williams 11C09 Vent Cap Els PW 17895 Use this furnace air pressureAs a seasoned technician, you know that maintaining the integrity of a direct vent wall furnace or gravity vented heater requires precise components that handle high heat exhaust and environmental exposure. The Williams 11C09 Vent Cap is a critical OEM replacement part engineered specifically for Williams furnace venting systems. This heavy duty furnace vent terminal is designed to streamline exhaust flow while providing a protective barrier against