My Whirlpool washing machine (2yrs old) recently started to smell, so I removed elbow/hose from bottom of drum to pump and discovered a piece of plastic wedged inside (new shirt collar packaging/stiffener). Inside the elbow is a rubber cup like piece and a plasic ball. I assume this must be some sort of non return valve mechanism, but I don't know how it should go back togeteher, as it fell apart when I removed elbow. It's very simple and if I could view a drawing, I could easily see how it should go back together. The Model is Whirlpool AWO/D 4505 and numbers of barcode decal on back are 85923321500, 340639040299. Can anybody point me in the right direction to find a drawing?