What is it?

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Hint

It looks like an electronic igniter. But that is just an educated guess.

Spark plugs for the Lennox pulse combustion gas furnace

Right you are.:smiley:

That’s correct. Pulse. It’ll be in the upcoming HVAC training course.

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What’s this?

TXV - Thermal expansion valve

TXV with external equalizer:D

Expansion valve. Yes.
It actually produces a spray.