At 01:26 PM 12/28/98 -0800, Baron wrote: >Yes to the anti-siphon "vented loop", if we can call that a valve. They >make them out of plastic or bronze and they are installed in-line at the >top of the loop to break the siphon effect when the water pressure >decreases. We had one in the sailboat, but also used a back-flow check >valve in-line just prior to the exit thru-hull. This is how the valves you buy at Home Depot for your house work. I'm concerned about them for marine use; however, due to possible failures caused by trash and corrosion. Who has a lot of experience with these on a boat, that you would like to share? Another method is to Tee in a vent to the top of the riser loop. You then run that high enough so that the head in that water column prevents it from spilling out the vent. That system would do the same thing, and be completely passive. It would also give you an indication when the line was getting clogged up, as you would be spilling water out the vent. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ :: Paul and Cindy Kruse :: KJV Joh 14:27 Peace I leave with you, 165 South Kenneth Court :: my peace I give unto you: Merritt Island, FL 32952 :: not as the world giveth, give I unto you. E-mail: plkruse@iu.net :: Let not your heart be troubled, 407-453-6206 :: neither let it be afraid. :: +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

I had a overboard manifold installed high in the engine room, well above the water line, which appears to be a 3" PVC pipe capped off at both ends into which are epoxied 5 small T's. 3 are for AC units and 2 are for bilge pumps. One 2" rubber hose connects the exit of the manifold to the stern of the boat. Benefits: only one hole out the hull, no need for check valves or siphon breaks, no drip stripes down the hull, complete silence, no noise of water running and splashing. This is what I think is a professionally engineered installation. AL Captain Al Pilvinis M/V Driftwood--Prairie 46 2630 N.E. 41st Street Lighthouse Point, Fl 33064-8064 Voice 954-941-2556 Fax 954 788-2666 Email - CaptainAl@Juno.com Website http://home.earthlink.net/~yourcaptain