it is an OEM-level replacement for Lennox part numbers 78B72

Retrofit Ready: Provides an efficient ZG-NM3 replacement path for older systems without requiring extensive modifications

Can the changeover point be adjusted

Running without it allows large debris to bypass the first stage

leak-proof seal in both vacuum and high-pressure environments up to 5

McDonnell & Miller 250-1-125 Valve Freon it is an OEM-level replacementThe McDonnell & Miller 250 1 125 is a high capacity ASME safety relief valve designed specifically for large scale boiler applications and water heating systems requiring a 125 PSI pressure relief valve. Built with a 1" NPT inlet and outlet, this industrial pressure relief valve features a robust brass body and a high temperature silicone rubber seat to ensure positive shut off and prevent leaking after repeated cycles. Rated for a significant