Always check the motor nameplate for the required microfarad rating

A separate DIN cable plug (Form A) is usually required to complete the electrical connection if the existing one is damaged

it ensures a leak-proof seal at the inspection plate

Whether you are performing an HVAC system diagnostic or a complete air handler repair

Whether you are troubleshooting a furnace not turning on or a dead contactor

Lennox 25W71 Gasket R-407A Always check the motor nameplateThe Lennox 25W71 Gasket is a critical OEM replacement part designed specifically for sealing the collector box cover in high efficiency Lennox furnaces. As a veteran tech knows, a compromised seal at the secondary heat exchanger leads to pressure switch trips and dangerous flue gas leakage. This precision engineered furnace collector box gasket (also indexed under 100742 01) ensures an airtight, negative pressure environment required for the draft