Lavac Installation

Boat Model Downeast ??
Boat Name Defyn Gravity
Zone of Work Systems-toilet
Author Todd Iorio

Here is a set of snaps of the Lavac installation on Defyn Gravity and a little write up.

# 1 The view from the top:
Plain and simple, the view of the Lavac installation in Defyn Gravity. You can see the location of the pump as well as the basic plumbing.  Note that there is no hose running through the bulkhead on the right.  Also note that the brownish gunk at the seam where the fiberglass meets the floor is not dirt but varnish from the previous owner’s somewhat mediocre job. To valves on the left control the from where and too where for the single pump. The bottom valve allows the pump to either pull from the bowl itself or the holding tank. The top valve determines where the outflow from the pump goes, to the tank or overboard. Yes, it is possible to pump from the tank to the tank. I haven’t gotten around to painting anything to cover the filled holes from the old bowl.


Detail of the pump and valves, see above. The handle with knob is from the bilge pump, cut down a bit to fit better. The bilge pump has the handle that came with this pump.


Geez, the camera is so good that I took these in the dark and didn’t realize there was a rag in there! Oh well, here is the under-sink detail, you can see the T in the sink drain which feeds the bowl.  Double hose clamps were not used but not for lack of trying. I simply couldn’t get the hose on the barb far enough trying every trick in the book. Thru-hulls are of the self-supporting type with integral valve.


Is a detail of the back-side of the valves. Although a bit tight, they are pretty servicable, when that dreaded time comes. The pump as well has access, although once again, tight. You can only imagine what a bear it was to snake the sea-land hose around back there.


Although you can’t see it from these shots, the two lines to the holding tank actually run underneath the liner directly below the bowl.  This also allows them to sit only at the very bottom of the port  hanging locker. Previously this locker was filled with valves and hose etc. The deck pump-out takes a T off of the return from the tank before that line leads to the lower valve. To pump out simply switch the lower valve to bowl, the upper to tank and let the pump run. With the bowl open the tank will pump dry, close to bowl to flush with salt water…


A really quick shot of all the siphon breaks (for the thru-hull and the bowl intake) as well as the deck pump-out line (I relocated the deck fill to accommodate this). You can also that at this stage of the game I got a tad tired of the whole ordeal and haven’t properly mounted the siphon break. With that sea-land hose it isn’t going anywhere but still. The small tube is the required siphon break for the water headed to the Lavac bowl.


#7 The proof is in the pudding.
This shot is looking in the lower port hanging locker. Notice the abundance of Aloha shirts which never would have fit in there before. The little hose on the right is the vent from the holding tank to the side of the hull. Haven’t bothered to strap it to the side of the locker yet. This is looking into the bottom of the locker. This is the extent of hose in the locker. The upper locker is devoid of all hose save the vent line which runs along the hull side.  Since I was there I painted all these lockers with some old (not suitable for ‘real’ painting due to age, etc) Brightside single part poly. Man did THAT make a difference. The finance will now hand her clothes in the locker and in fact, took over the entire stbd. side hanging locker. The black tape around the aft section of hose is PVC pipe tape, I used a fair bit in the areas where the hose passed through bulkheads to help prevent chafe. Note the epoxy drippings on the hose from a quick couple of hole fills to prevent stuff from the upper locker falling into the lower (where the old hose used to be)


Missing from this pictorial are shots of the holding tank. It’s the original 8 gal. located under the little convertible seat in the stateroom. It’s not very exciting but I pulled it, cleaned at, and put about 5 coats of slightly thickened west system on it, there were areas where is seemed a bit thin. I also had to replace all the fittings, and  used PVC pipe which was bonded and then glassed to the original fittings. 3M 4200 holds the tank in place. The original pump is no longer needed and was scrapped.

All in all it took about 3 days of work and a lot of very expensive hose. However, it doesn’t stink, it doesn’t leak, and I got two very important storage areas back. It also made the fiance who lives aboard with me MUCH HAPPIER. Therefore it was a complete success!

Fair Winds!

-Todd Iorio
s/v Defyn Gravity

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