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Michael, you are hearing that noise only while filling the tank, right? And not other times?
Keystone told us when we are filling the tank from the connection center switch, we should always remove that cap at the back of the rig. Supposedly when filling this way the water comes in at a higher rate than the small vent can exhale displaced air. That can cause a pressure buildup and even rupture the tank. I think Dsprik has some firsthand experience with this and it was at that time I was told this.
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