Y-valve Installation Advice and Troubleshooting

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All waste plumbing hoses should be kept as short and straight as possible with no dips where waste could collect. The diverter valve should be located for easy access to the selector handle and free of other stored “stuff” that could bump the handle. The handle positions should be clearly marked for no confusion as to tank or overboard. Before mounting, make sure there is enough room for all three hose fittings and hose bends. Use 120- or 90-degree hose fittings where necessary to prevent tight bends in discharge hoses, and make sure to use the correct reinforced hose designed for sanitation systems.

A Y-valve can also be reversed and used in a bilge-pump arrangement to select between two separate bilge areas using only one bilge pump.

In most boats, these valves are used infrequently, so one of the main problems is that they become stiff, hard to operate, and even lock up. The other problem, as with all parts of the onboard sanitation system, is a slight leak either through the hoses or by the housing or handle that could cause odors.

For more on onboard sanitation systems, check out our recent reviews of waste hoses (PS, April 2012), holding tanks (PS, February and April 2012), and holding tank deodorizers (PS, March 2012).

Darrell Nicholson
Practical Sailor has been independently testing and reporting on sailboats and sailing gear for more than 50 years. Its independent tests are carried out by experienced sailors and marine industry professionals dedicated to providing objective evaluation and reporting about boats, gear, and the skills required to cross oceans. Practical Sailor is edited by Darrell Nicholson, a long-time liveaboard sailor and trans-Pacific cruiser who has been director of Belvoir Media Group's marine division since 2005. He holds a U.S. Coast Guard 100-ton Master license, has logged tens of thousands of miles in three oceans, and has skippered everything from pilot boats to day charter cats. His weekly blog Inside Practical Sailor offers an inside look at current research and gear tests at Practical Sailor, while his award-winning column,"Rhumb Lines," tracks boating trends and reflects upon the sailing life. He sails a Sparkman & Stephens-designed Yankee 30 out of St. Petersburg, Florida. You can reach him at darrellnicholson.com.