sink drain hose- a risk?

[eianm]

My 1991 H42 is now 23 years old, but is in much better condition than most boats very much younger than her- due primarily to exceptional maintenance throughout its life and 3 previous owners and to the clearly high quality materials used by Hunter originally. I have probably replaced too much, but I love my boat! I have one nagging concern- the hose from the galley sink to the through hull is original- this is a large dia. hose to a large dia. through hull. The original hose looks similar to swimming pool vacuum hose- it seems to be in good order but I am wondering if I should replace it as a precaution.
The only reason I am posting ai I cant seem to locate a replacement hose that is flexible enough for this short and twisty run - any thoughts??

 

[kloudie1]

Sink Hose

Too cheap an item to worry about. If you are concerned, best to change it. The part that lots of folks don't think about is the connection at the sink itself; the piece that the hose clamps onto. Many of these rust in the threads of the nut holding it onto the sink. When it fails, the top falls down and then there is a full size hose connection open to the water. Many folks will tie the hose up (small line or plastic wire ties) so it cannot fall below the waterline if the drain fixture fails.

 

[Benny17441]

Make sure the hose is double clamped at the thru-hull and that each clamp is oriented in opposite direction. Check these clamps periodically. I have seen hoses like that going strong after 30 years but I do recommend you verify its integrity. I would remove it and compress it and twist it by hand to see if it breaks. If it retains its strength you may choose to put it back and check it again at a future time. Kloudie offers an excellent idea to tie up the upper part of the hose to keep it above the water line no matter what happens. Clamps have a tendency to corrode and break with no tell tale signs so a thorough periodic inspection is recommended.

 

[charliegrau]

You can probably also put a valve at the thru hull so you can close off the opening.

 

[kito]

You can probably also put a valve at the thru hull so you can close off the opening.

This is what I am going to do only problem is the thru hull is a 1-1/2" nps (straight) thread and can't seem to find ball or gate valves to fit.....only npt threads. I heard that they can be used but need extra tape or dope but would rather have the correct thread.

 

[woodster]

This is what I am going to do only problem is the thru hull is a 1-1/2" nps (straight) thread and can't seem to find ball or gate valves to fit.....only npt threads. I heard that they can be used but need extra tape or dope but would rather have the correct thread.

go to mainsails site and look up through hull instalations and read about the Groco adapter it has straight threads on the through hull side and tapered threads on the valve side.....

regards

woody

 

[justsomeguy]

Making his "short and twisty run" even shorter.

Dang, boats are something, aren't they?

Edit- Oops, not the OP.

 

[kito]

go to mainsails site and look up through hull instalations and read about the Groco adapter it has straight threads on the through hull side and tapered threads on the valve side.....

regards

woody

Thanks Woody. I seen those adapters and will go that route. Just was hoping to find an affordable valve with nps threads to avoid possible additional leak joints.

 

[kito]

go to mainsails site and look up through hull instalations and read about the Groco adapter it has straight threads on the through hull side and tapered threads on the valve side.....

regards

woody

Can someone be kind enough to help an old man find this fitting that Woody talks about that MS used?....I can't find it Groco web site only has the nps to hose barb tailpiece.....no nps to npt.

 

[woodster]

try Defender or Hamilton marine under plumbing...


regards

woody

 

[Paul Cossman]

P42 sink drain hose

Hi Eian,

From your description of the type hose, "similar to a swimming pool vacuum hose," I believe it is the original hose. If it is the same as my 1991 vintage P42 original hose, it likely has a cuff on the end of the hose. That cuff poses a danger, as you can end up with good clamping at the sea cock/through-hull, yet a failure due to the hose cuff separating from the hose itself.

I replaced my hoses with the heavy-duty thick walled white hose, which is not flexible at all. I can't remember how much trouble I had installing that hose, but you only do it once. That also addresses the issue raised by others as to a potential failure where the hose is connected to the sink drain fitting. I have had those rust out and the only issue is a leak at the drain, as the heavy duty white hose will not go anywhere. It remains in place regardless.

I can't remember if my boat came with it or if I added it, but there is a "T" fitting under the sink where the two sink drain hoses meet at the juncture, then the single hose goes to the drain. If I remember correctly, the aft sink drain hose runs straight down to an elbow and then to the "T," whereas the forward one continues past the T straight down to the seacock. It's a short and easy run.

If you're getting to the point of hose upgrades, you're doing well!

Cheers,
Paul

 

[charliegrau]

If the thru hull is normally above the waterline I would think you could use a PVC valve from your local big box hardware store. That should provide the additional protection you are looking for.
-charlie

 

[IH82BL8]

That's very odd. My '84 H31 has a seacock on that thru-hull (as well as all the other thru-hulls below the waterline). Do you think one of the previous owners removed it?