the way my washing machine waste is plumbed is totally incorrect as well as dangerous..i learned this with the purchase of a new washer and dryer!!..the waste line for the house goes out about midway up the basement wall out into a cesspool..i plan on re doing all the waste lines..after i re plumb every thing i realize the washer waste will be the lowest point and when, not if the cesspool backs up, it will empty into the basement!! is there a 2 inch check valve for this application..i tried serching around and any thing i've seen is for sump pumps..there will really be no pressure pushing out so i dont think this will work..any ideas i saw this valve online