Back flow preventer on the tank flush hose. I either had it plug up or leak (can't remember) and took it apart. There is a little 'ball' inside that slides in the tube - I think it got stuck. I took out the ball and no more trouble backflushing. I do need to use a preventer on the outside hose connection, tho.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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