Lennox 78L20 Valve 322838-753 provided the part number matches

provided the part number matches the service manual

the Apollo 50-GB Series is fully compatible with natural gas

How does this gasket prevent steam trap failure

Contamination

Lennox 78L20 Valve 322838-753 provided the part number matchesThe Lennox 78L20 Valve is a professional grade thermostatic expansion valve (TXV) designed for precision refrigerant metering in 3 ton residential and light commercial AC units. Engineered specifically for R22 and R407C refrigerants, this OEM component regulates flow into the evaporator coil to maintain optimal superheat, preventing liquid slugging and protecting the compressor from premature failure. Featuring a 3 8" x 1 2" ODF (Outside Diameter