Lennox 51W91 Pressure Switch

-.95"wc SPST dual 1/4" barb connection Pressure Switch

51W91 is the direct replacement for 56M0501

Lennox 51W91 Pressure Switch – OEM SPST Dual 1/4" Barb (-0.95" WC)

The Lennox 51W91 Pressure Switch is a genuine OEM SPST pressure switch designed to ensure safe and reliable operation of Lennox HVAC equipment. Rated at -0.95 inches water column (WC), this switch features dual 1/4-inch barb connections for secure tubing attachment and accurate pressure sensing. It plays a critical role in system safety by verifying proper airflow and pressure conditions before operation.

Product Highlights

• Brand: Lennox

• Part Number: 51W91

• Product Type: Pressure Switch

• Switch Type: SPST

• Pressure Rating: -0.95" WC

• Connections: Dual 1/4" barb

• Compatibility: Lennox HVAC equipment

• Condition: Genuine OEM replacement part

Product Description

The Lennox 51W91 SPST Pressure Switch is manufactured to original Lennox specifications for precise performance and dependable durability. By monitoring negative pressure levels, this switch helps prevent improper system operation and potential damage. It is an ideal replacement for failed or worn pressure switches in compatible Lennox heating and cooling systems.

Trusted by HVAC professionals, the 51W91 pressure switch helps restore system safety, efficiency, and long-term reliability.