You have a fairly new coach and your valve shouldn't be bad. Most likely, there is debris in the seal. Your valve has a blade sandwiched between two O-rings. This creates a slot that the blade slides in. Often, this "slot" gets debris in it, like toilet paper, where the valve slides into it's closed position. If you can reach the O-rings, take a coat hangar and clean out the slot (area between O-rings).
If you do need to replace the valve, keep in mind that it rotates. Often they are stuck in one position and need a little force to move them. Moving the valve makes it easier to access the four bolts, which are 3/8 of 7/16. I like to use a 1/4" rachet.
One of the problems when installing the new valve is keeping the O-rings in place as you slide the valve between the two plumbing ends. I like to use a little Vaseline to keep them in place during installation. Another trick is to take a one gallon plastic milk carton and cut two pieces out of the sides. Make the pieces a little bigger than the O-rings. Place the two pieces on both sides of the valve, covering the O-rings and then insert the valve between the plumbing pieces. Once in place, slide the plastic out. This will keep the O-rings in place.
The Valterra valves are cheap, like $13.00, so it's not bad idea to have both a black and grey tank spare.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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