31 Gal Flex Tank, Water System W/ Transom Washdown / Shower

Published date: June 11, 2007
  • Boat Type: Boat Type

Water system:
This water system plumbs lines to the head, transom [outside] &
the galley. It'll provide 31 gals of freshwater to all outlets. By
adding the raw water inlet, @ the transom, on a 3/4" garden
hose Y valve with shutoffs, you have a fresh or raw water
washdown / transom shower on deck; And an unlimited water
supply for the boat.

Parts include but not limited to:

31 gal Plastimo flexible tank
Johnson washdown pump system
2 Brass Y valves W/ shutoffs [Loews Gardening or Home Depot]
Preferably with metal shutoffs

1. Temporarily remove styrofoam from upper bow area. Decide
placement of water inlet. I chose the black stripe on starboard
side, near the front hatch opening.[Pic 1] Seal and screw in
fixture; run water inlet line through to very front.
2. Drill hole through upper bow box at very front.
3. Drill or widen current opening [access panel in V berth] to the
bow floor. Hose will show a short distance
4. Remove foam from lower V berth for flexible tank. Install
here.
5. Make a hand sized cutout in the middle of the V berth
forward cover. When work is completed you'll reach between the
v berth mattresses and check level of the flexible tank by feel
here.[pic 2] note water inlet hose showing in front & Dri deck
cover for air circulation under mattresses.
6. I tried to place moved foam in other boat areas.
7. Drill hole through fiber glassed wall that separates front foam
compartment. Run water out line through next available
compartment. I chose the port side opening and added a water
filter and shutoff. [Fresh output 1]
8. I used 1/2" poly hose with 3/8" ID, from Home Depot for all
runs after the shutoffs. Run line from shutoff down starboard
bilge through to transom. Because the hose is so small you can
feed it through your large cable through 2X.
9. Feed "Fresh output 1" through transom hole route to the A
side of 1 brass Y valve which we'll use as a 2 feed input valve.
The B side of the Y valve will be used later as a raw water inlet.
By connecting a short hose that can be dropped into the water
or a bucket, later.
10. Using short appropriate diam hose connect the Y stem to the
filter of the Johnson washdown system. I chose to make this
filter accessable to the rear transom to keep an eye on it, which
required some improvisation of the system parts.
11. Feed line from valve stem back through transom opening,
and into the Johnson Pump In. I stationed the pump inside,
under the cockpit at the rear wall of the aft berth. You want to
keep the raw water suction run to less than 5'. You accomplish
the same with the 26' freshwater line by priming its line.
12. Connect 2nd Y valve to the pump out. This #2 valve will run
the A output to your transom washdown hose. This output will
require it's own opening in your rear transom with either a quick
connect or male garden hose out. This will be housed on your
transom and is covered by other mods ie: [url= http://
macgregorsailors.com/cgi-bin/modtracker.pl?
action=view&record=783] Jack's Washdown [/url] and [url=
http://macgregorsailors.com/cgi-bin/modtracker.pl?
action=view&record=526] Mark Chamberlan's [/url]
were my inspirations. I chose a straight handle multi tip garden
nozzle whose dial includes: misting, jet, flat, spray shower etc.
13. The B output is split to supply the galley and the head. Use
any faucets you'd like. I used those I had on hand. [Pic 3]
14. I tend to leave both outputs of this #2 Y valve in the open
position.
15. Seal all connections and clamps with compression tape, so
they remain water and air tight.

Regarding the #1 Y valve. I leave the raw water inlet [formerly
called B side] closed until needed. However, this input can also
be used to fill the freshwater bag by connecting a garden hose
at the transom with a double female 3/4 garden connection. BE
CARFUL TO NOT OVERFILL.

Happy Boating
-Gaz

Published by: Gazmn


Model Year: 2007

Share

Useful information

  • Perform modifications at your own risk
  • Fully research modifications before performing yourself
  • All mods are listed as is with no waranty
  • This site does not make any claims about the validity or safety of modifications posted.

Related Mods

  • Bilge pump
    Bilge pump
    Water Systems - - December 1, 2019

    I installed a West Marine 2000 GPH bilge pump with 1-1/4" hose and a float switch under the cooler. I routed the hose to the transom thru-hull. It took about fourteen feet of hose. In the right of the large picture you can see the transom thru-hull j...

  • Faucet
    Faucet
    Water Systems - - December 1, 2019

    I highly suggest this relatively cheap modification! We added an electric faucet (small pump in-line) controlled at the faucet by a turn knob, not by a button. The button ones mean you have to hold the button down, where the knob one works just like ...

  • Water tank and deck fitting
    Water tank and deck fitting
    Water Systems - - December 1, 2019

    I replaced the starboard water tank with a better one (flexible type) which is now located below the cooler chest. The filling pipe goes below the headroom through the closet in the headroom and up on deck. You see the filling fitting on the picture....