...you might have read my earlier post on the aft head valve, well here's the deal on the fwd head valve. i noticed rust stains coming from the 115v AC outlet. i opened up the outlet and the metal box was covered solid with rust. ...guess what was about 8 or 10" from it?....is that your FINAL answer? (as in the aft head), the fwd head anti-syphon valve was also completely missing from the u-bend. this valve is very easy to get to. (in the v-berth), the wall between the v-berth and fwd head, look to port and see a small inspection plate, 4 screws. take care, Jim Vincent / Toucan