Deckwash pump on a 2007 B40.

Gunni · Dec 2, 2017

No utility to having a thru-hull that is difficult to access and operate if you already have one available at the cost of a few extra feet of hose. Tee it into your head raw water system and you can winterize the wash down via the hose on your head fitting. Very convenient.

Ron20324 · Dec 2, 2017

Gunni said:
No utility to having a thru-hull that is difficult to access and operate if you already have one available at the cost of a few extra feet of hose. Tee it into your head raw water system and you can winterize the wash down via the hose on your head fitting. Very convenient.

I've seen this idea offered, but do not recall anyone actually having done it. My concern would be the electric sump sucking the guts out of the head pump. My 2 cents. I have a thruhull under the vee hanging locker.

Gunni · Dec 2, 2017

Been plumbed this way for 14 years, no problems. Remember, your head raw water pump has to hold pressure against the supply side (thru hull) to push water into the bowl.

SG · Dec 2, 2017

We have a Groco strainer off a thru-hull. From the strainer we "tee" to a Groco washdown pump kit and to the head.

For a variety of reasons, I think one wants to have a strainer on the intake. If you sucked-in a nettle or some eel grass, you'd be sorry. Maybe that doesn't happen to often, but with a lot of use of the wash down pump in anchorages, you'd be sorry if it did :^))).

I don't think the issue is what happens when the pump is off (because the head's pump should provide enough of a barrier). As long as you aren't trying to use the head at the same time as the washdown pump, you'd not notice it. (There was an old joke about an "automated Tampon remover" on an airplane that I recall, but I'll leave that for another time over a drink.) :^)))

The other advantage, is that if you have a bunch of stale water in the intake line to the head, if you simply run the washdown pump about 10 seconds or so, you'll "flush" the water out. It won't make the harbor water fresh -- but it will be substantially less smelly.

The strainer would be a good idea. As Gunni says: i) Why another thru-hull?; and, ii) if you're going to be winterizing, it makes it VERY easy to suck the water from the head hose to fill the strainer, get to the pump, and have enough anti-freeze in the line so you don't have to futz with the thru hull.

btbogdan12 · Dec 11, 2017

friesen said:
Hi everyone
I am planning to install a deckwash pump on a 2007 B40. Based on various websites I have scanned, I am thinking of putting in a new thru hull under the V berth, and connect the pump to the bow thruster battery that is also located there. I was anticipating of running the hose from the pump through the anchor bulkhead, using fittings at the bulkhead, and then up to the deck in the anchor locker. I did not want to try and run a hose or pipe through the forward cabin.
I have no thru hulls already in the forward cabin to T the water supply into (only one mid cabin head on this model). Suggestions?

I installed a washdown pump on a B 40, 2011. I teed off the intake to the head in the main cabin. I ran the water hose along the starboard hull foward to the anchor locker bulkhead. I put in an access port in the bottom of the anchor locker and that allowed me to put in a connector fitting to connect the hose from the head intake to the hose for the washdown. The pump for the washdown was installed in the starboard seat locker and electrically connected to the electrical panel on the port side with a circuit breaker.

seadaddler · Dec 11, 2017

I also tee into head thru hull and ran plastic piping up into anchor locker and pump is under floor where other thru hulls are and fuse and switch under where main breaker all are.
Nick

Ron20324 · Dec 12, 2017

On my B323 I put a new thruhull under the vee hanging locker. The pump is under the bunk, the hose connection is on the side of the anchor locker "platform". So, what's another hole in the boat? Where I took the head intake off the thruhull (to put it on the sink drain) is now just a seacock not connected to anything. On one of the haul-outs, I'll move the sink drain to the head seacock, and glass over the old sink drain hole.