Sink Water Supply

[Jschen01]

Has anyone had to refurb the water lines to the sink from the tank and from the drain to the through hull? Looking to confirm some things:

1. on the drain to the through hull. Looks pretty straightforward - just going to replace the through hull with a Marelon through hull and attach a seacock directly. Thinking about putting a laminate sheet in to strengthen around the hole in the hull and provide a more flat surface to connect the through hull. Make sense?
2. Where I am having an issue is with the routing from the tank to the tap. I cant figure out how to get water to the sink from the tank. The water tank that was in the boat when I bought it is a Riblet J-2 5 gal tank. It is in very good shape no leaks, clean inside - see second picture. It has two openings on the top of the tank - one is 1.5" and one is 1/2". The tank has solid caps for both which allows the tank to be closed off, but dont know the setup for using it when pumping water to the sink.
   1. The question is whether the small or large opening is used to draw water from the tank and send it to the sink tap.
      1. Option 1 use the small opening - There is one fitting that does thread on the outside of the small opening (see first picture). There is also a piece of 3/8" tubing that I assume is the actual pickup line but it isnt connected to anything. It does fit through the small opening though. Is this the normal way this was set up? That I would reverse the barb in the fitting and connect it to the pickup tube?​
      2. Option 2 use the large opening - My original assumption was that I need another cap to the 1.5" opening that allows me to connect a pickup tube inside the tank to the water line to the sink tap, but havent a clue where to locate one or whether it is something I need to "engineer".​

Anyone using this setup that could help me understand how to set it up? Any insights would be greatly appreciated

 

[Sunbird22358]

In theory, there should be 3 connections on the tank. 1) the 1.5" would be for a deck-fill (or if you have access to the tank and htis cap with tank in place in boat, just bring the hose inside to the tank to fill it, or fill fro ma portable jug. We did it that way on our old CAL 21 for 38 years, never had a deck-fill) 2) the 1/2" connection for a vent (overboard or just run high up inside cabin) 3) another connection to use to draw water from tank with sink pump. Would need to be low on tank side or if mounted on top of tank, have a draw-tube that reaches down into tank to near bottom of tank.
On our CAL we used a collapsible "water-carrier" type tank that only had one cap (originally had a close-able spout on that connection) we replaced the original spout with a solid cap that fit, then added a thru-hull to that cap (1/2" I think) on which we installed a short hose with a standard garden hose male connector. Onto that connection we attached a garden hose Y-valve (used to connect 2 hoses to one faucet that had shut-offs on both outlet connections. One connection was connection for hose to galley pump, the other was our fill connection. Since tank was flexible and could just expand/contract as we filled/emptied it, we did not need a vent. We positioned the tank do that connections were below level of water in tank, and usually purged any air out of tank after filling. I guess the suggestion that I would offer to you is to maybe use a "bulkhead fitting" in the large cap, (aka a fitting that mounts in that cap (or if you have access enough, could be on top surface of tank?) that will have 2 hose barbs, one inside cap and one outside, so hose to galley pump connects to outside and a hose that reaches into tank allows water to be drawn out. Remove cap to fill tank, or use a garden-hose type Y-valve to allow a fill and draw from same connection. I'll post a few shots of our setup, I would probably use a real seacock instead of just a thru-hull and ball-valve on the drain if I were to do it again, but space was limited on the CAL 21. The last picture showing me holding a quick-connect fitting is the short hose tail that we had connected to the Y for connecting a hose to fill tank.