Galley Sink Drain Hose

[Schwarz633]

My 1982 Tartan 33R has a locker under the galley sink. When I purchased the boat this locker was unusable, as all the water line hoses were pretty much covering the bottom, laying against the hull. I got a new foot pump (with the hoses on the left side instead of the right side), replumbed the hot/cold water, installed a light, and made a false bottom for the locker.

The remaining item is the sink drain, it hangs down way too far. Unfortunately, the low profile drains that I've found (Scandvik Drain) won't fit the 3-1/2" drain hole in my sink. My plan is to replace the sink drain with one that doesn't hang down so low (Amazon Drain), screw on a 1-1/2" NPT PVC elbow (Amazon Elbow), and then reduce down to a 1" hose barb. I'll also reduce down to a 1" brass hose barb at the seacock. I think the existing 1-1/2" hose is unnecessary for my needs.

My question is regarding the type of 1" hose to use. West Marine and MPI seem to think that 162 hose (162 Hose) is suitable for connection to "under the waterline" thru-hulls. Trident thinks otherwise. What is the correct type of hose to use for this?

 

[dlochner]

I use Trident 147. It is a heavy duty hose that is reinforced and relatively easy to work with. I would not use 162 for anything below the waterline.

There is little advantage to reducing the size of the hose to gain more space. It will slow down drainage and all the adapters are potential sources for leaks.

To install 147 I heat the ends of the hose in hot water and slip them onto the fittings coated with a water soluble lube.

 

[dLj]

I'll also reduce down to a 1" brass hose barb at the seacock. I think the existing 1-1/2" hose is unnecessary for my needs.

Two comments:

1) Do not use s brass hose barb. Get a bronze hose barb.

2) i disagree that 1" is appropriate. I'd stick with the 1 1/2".

dj

 

[Tally Ho]

I replaced my sink drain (a bit too late in the maintenance cycle to be sure). I believe I used 1” as that was what was there originally. I have a double-bowel sink so I have extra junk under my sink…

Greg

 

[BigEasy]

I replaced my sink drain (a bit too late in the maintenance cycle to be sure).

Greg,
Excellent video! Illustrates point that sometimes what is real isn’t readily apparent until it breaks or fails. I would say you timed your hose replacement at the maximum life cycle! And, excellent point that thru hull fittings should remain closed. We had a boat on our dock that sunk because of rotted galley sink hose. I replaced my hose last year at same time that I replaced the thru hull assembly. Used Saniflex waste hose as I had a sufficiently long piece in my garage.

 

[Schwarz633]

I went ahead and replaced the sink drain with one that was shorter and was able to cobble together what I think is a pretty good solution using the existing 1-1/2" hose. The key was discovering the black 90° garbage disposal tailpiece. Seems like a lot of slip joints, but they're all above the waterline. I can't believe Tartan (or whoever) put the sink drain in with silicone. Didn't they have plumbers putty in 1982? I was going to replace the 1-1/2" hose, but the seacock connection is over a nipple, not a hose barb. That looked like it would be a struggle best left alone for now. I'll get a bronze hose barb and replace it when the boat is on the hard.

 

[Tally Ho]

Looks like it should work. But still would close that thru hull when you are not on the boat.


Greg

 

[BigEasy]

Looks like it should work. But still would close that thru hull when you are not on the boat.

Definitely!