What was the previous part number for this item

it ensures a leak-proof seal at the inspection plate

and carbonized oil from the refrigerant stream

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

5 lb stem force and a 1/4 inch stroke length

Lennox 25W71 Gasket R-407A What was the previous partThe 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