One more thing you will need to know is that in some trailers the Gray water tank for the bathroom is below the Black water tank and lower level then the kitchen grey water tank. If you open both valve it will fill the lower tank first. It will cause the bathroom tank perform the same as full. I use the Washer and the bathroom tank fills first, The bathroom tank has to be full before it can reverse to the Kitchen one. So this don't work for my unit.