this HVAC pressure switch prevents the operation of the heating system under unsafe drafting conditions

Utilizing genuine Amana-Goodman parts ensures proper fitment within the cabinet

The 40VA (Volt-Ampere) rating defines the maximum power load the transformer can handle

The stainless steel armor protects the internal copper capillary from mechanical damage and work-hardening failures

Lennox 79J87 Check Valve 318423-701 this HVAC pressure switch preventsThe Lennox 79J87 Check Valve is a critical OEM replacement part engineered for precise flow control in residential and commercial refrigeration systems and HVAC units. Built for high pressure durability, this 1 2 inch brass check valve facilitates unidirectional fluid movement, effectively preventing backflow that can lead to compressor slugging or terminal system failure. Its NPT fitting design ensures a secure, leak resistant connection, maintaining