Resideo VCZAS1100 Valve 318518-761 the 99M69 is the official

the 99M69 is the official direct replacement

What causes the original reflector to crack or yellow

By modulating the flow of R-22 refrigerant based on evaporator load

As a veteran-grade flue gas temperature sensor

Most failures result from moisture backflow from the secondary heat exchanger or excessive heat due to restricted venting

Resideo VCZAS1100 Valve 318518-761 the 99M69 is the officialThe Resideo VCZAS1100 Valve is a professional grade 1 inch sweat zone valve designed for precision in high demand hydronic environments. This two way cartridge cage valve features a 6. 6 Cv rating and a linear flow profile, making it the standard choice for balancing domestic and light commercial heating and cooling systems. Built with a rugged bronze body and a stainless steel stem, the assembly provides a reliable 60 psi close off pressure rating,