Ours does not have a vent filter (assuming it's the orange cannister upper left of your pic). Our vent line follows exact same route as yours except it goes direct to the vent instead of up to the vent filter and back to the vent. Sure hope the guy I've scheduled with does come out to do the Y valve and will have him use his heat gun to get the vent line on the top of the tank off the elbow to check. If not, I will cut the vent line close enough to the tank to have good probe access and then re-connect with the coupling I bought.
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