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Kent
My 2000 H3 (chassis date 1999} Featherlite aux tank check valve is on the back side of the aux tank.
BUT…
The tank is a pain in the A_ _ to get to. Lower the front bumper access, swing out the front Criusair, then look up. There is a sheet metal panel that has 3 sheet metal self taping screws across the front and a single screw in the middle of the panel. Once removed the piece of sheet metal can be slid out from the front and you will see aux tank tucked up above the Cruisair units.
Now the fun starts, the check valve is on the back side of the tank with little to no room to work with because of the Cruisair unit right below it. I was able to disconnect the air lines, unbolt the mounting brackets and wiggle the tank out and have full access to the check valve. If the Cruisair wasn’t in the way accessing the valve would be a lot easier.
Chuck