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Descant · 07-11-2020, 10:48 AM

Most boats have a Y valve so the waste water can be dumped when you are out to sea. Many of those only function on black water and just let grey water go overboard. That's the way mine was and I had to have the gray water routed into the holding tank before they would launch the boat. If you trailer and launch yourself, you take a chance. Don't have my registration here, but I think there is a Y/N block on your registration that DES can cross match with stickers issued. Even though it goes to a holding tank and then into municipal pump out / sewer, I'd be careful about what goes into the sink or toilet; Marine heads can be delicate and expensive to repair / replace. Some gray water goes into a sump in the bilge and the bilge pump throws it overboard. Not legal, so trace your plumbing all the way.

07-11-2020, 10:48 AM	#8
Descant Senior Member Join Date: Mar 2006 Location: Merrimack and Welch Island Posts: 4,039 Thanks: 1,212 Thanked 1,518 Times in 985 Posts	Y Valve Most boats have a Y valve so the waste water can be dumped when you are out to sea. Many of those only function on black water and just let grey water go overboard. That's the way mine was and I had to have the gray water routed into the holding tank before they would launch the boat. If you trailer and launch yourself, you take a chance. Don't have my registration here, but I think there is a Y/N block on your registration that DES can cross match with stickers issued. Even though it goes to a holding tank and then into municipal pump out / sewer, I'd be careful about what goes into the sink or toilet; Marine heads can be delicate and expensive to repair / replace. Some gray water goes into a sump in the bilge and the bilge pump throws it overboard. Not legal, so trace your plumbing all the way.