this is a direct-fit solution that eliminates the need for field modifications

skin oils can cause premature failure

Proper calibration of the manifold pressure during installation is critical to achieving the specified BTU output and maintaining low-emission operation across the firing range

It is not rated for steam applications

It serves as a direct professional replacement for the Honeywell RDS-18

Lennox 25W27 TXV 319825-402 this is a direct-fit solutionThe Lennox 25W27 TXV is a critical OEM thermal expansion valve designed for precise refrigerant flow control in high efficiency cooling systems. Engineered specifically for Lennox air conditioner units and heat pump systems, this brass body metering device optimizes evaporator performance by maintaining an exact superheat. As a veteran grade HVAC replacement part, the 25W27 ensures the quantity of refrigerant entering the coil matches the thermal