any veterant HVAC tech knows you must install a 4

Direct Replacement: Simplifies repairs in systems utilizing fixed expansion valves or standard #45 orifices

Will this fix a humming outdoor unit

the unit is rated for an ambient temperature of 275°F

Does this kit include the solenoid coil or just internal parts

Lochinvar & A.O. Smith 100278117 Gasket 340155-7026 any veterant HVAC tech knowsProfessional grade maintenance requires precision components that ensure a gas tight seal and reliable combustion performance. The Lochinvar & A. O. Smith 100278117 Gasket Set is a comprehensive OEM replacement part specifically engineered for high efficiency condensing boilers and water heaters. As a veteran technician, you know that reuse of flat gaskets or fiber seals during a heat exchanger service leads to nuisance lockouts and dangerous flue gas