it is sold "less flange" to allow for compatibility with various existing SAE or ODF flange configurations

For field technicians and contractors maintaining York air handlers and electric furnaces

The conical end must face the distributor/inlet to ensure the Teflon ring seats correctly and prevents refrigerant bypass

allowing for either normally open or normally closed wiring configurations based on system requirements

Nordyne 1018498 Hose Kit 326058-755 it is sold "less flange"The Nordyne 1018498 High Altitude Pressure Switch Hose Kit is a critical OEM component designed for Nordyne furnace high altitude conversion. When operating HVAC equipment at elevations exceeding 5,000 feet, the decrease in atmospheric density can lead to insufficient negative pressure, causing frequent nuisance lockouts or cycling of the induced draft blower. This kit features a pressure switch hose with diverter specifically engineered for Nordyne