Sink hose below water line.
- Thread starter NYSail
- Start date
I don't think vinyl is acceptable for below waterline connections. You need good wire reinforced hose. Typically Trident or similar hose. Trident white sanitation hose is probably a good low cost choice for this application. Below water line there is a small amount of pressure probably about a half PSI.
Hello NYSail,
I agree with jibes138. The 1.5" Trident or similar sanitation hose would be fine. The bending and fitting may be difficult, but more sturdy than the reinforced clear plastic. Double clamp at the thru-hull end for sure and use the shutoff valve if installed. (Have the bilge pump ready if there isn't a shut off valve!)
I agree with jibes138. The 1.5" Trident or similar sanitation hose would be fine. The bending and fitting may be difficult, but more sturdy than the reinforced clear plastic. Double clamp at the thru-hull end for sure and use the shutoff valve if installed. (Have the bilge pump ready if there isn't a shut off valve!)
Not sure why wire reinforced hose would need to be used... so many other boats have sanitation lines and engine water intake lines, exhaust hoses, cockpit drain lines and sink drains that arent wire reinforced so i dont see why you would need your sink drain to be wire reinforced... a wire reinforcing will NOT help prevent a rupture (unless there is high pressure), but will only keep it from collapsing when there is a moderatley tight bend in it...
Regular automotive heater/radiator hose is built for a long life in a harsh enviroment, it is reinforced and built to withstand pressure, so in a sink drain i would use it like others have for years...
And 1.5" sink drain??? The sink and vanity drain thru hulls are usually either 3/4" or 1", so why such a large hose?...
If there is any resizing of the drain line, it needs to be made right under the sink and not at the thruhull or elswhere below the waterline.
Have a little faith the OP knows what he needs. My galley sink drain is 1.5, and I used the clear hose with black reinforcing. I wanted to be able to see where the waterline was!
i have nothing below the water line that doesn't have a seacock valve..... if any hose happens to fail i can shut off the valve to stop the ingress of water ...so if you want to use clear reinforced hose i see no reason not to use it as long as you have a shut off valve...other than it may not pass the survey inspection...... don't know what the regulations are on that
Ive seen the reinforced poly hose used a lot... i dont see any reason why it couldnt be used... it is commonly used as freshwater supply lines... under pressure.
Ive been around too much to have faith until i know the person a bit more....
Ive seen the way people work on their boat, what they bolt on, why, and how so many previous owners have created situations that may not be obvious to the current owner...
And im not trying to insinuate that im perfect or correct in my methods, (but i try my best) and with this knowledge, it prevents having any faith other than the faith in the fact that they are actually working on a boat...
Im on the phone app so i cant see what kind/size/age of boat he has or where he is located... there are manufacture, size and regional and era differences that may dictate how the boat is equipped, but not many older sailboats boats 40ft and less here in the northwest have a 1.5" thruhull and ballvalve on the galley sink drain...
On my own boat the only below waterline thruhulls/ballvalves over 1" is the (2) 2" cockpin drain lines...
Mine is 1.5". For a double sink. Hose is black. Looks like engine exhaust hose. I think S2 had a lot of it at a good price. They also used it for the fuel tank filler hose. Was a big source of diesel smell......
when i replaced the sink drain plumbing in my boat i used a 1 1/4 " through hull and valved mounted the way mainesail does it and the drain pipe out of the sink basket is 1 1/4" so i was good to go ...i did use that white hose that most use for holding tanks ..not the 101 stuff just that plastic spiral wound like they use in the hot tubs ...i know i could have used the trident 101 but i just didn't think it was a big deal for that
I've done the same thing with 1 1/2" hose. It's never given me any concern.
Two clamps per end, good valve........why sweat it..
Side bar: I bought an O'day 26 in NY on the Hudson, and the yard that did repairs on it after hurricane Sandy cut and sealed the two thru-hull sink drains. There were no valves, just silicon plugging the holes. Kinda shocked me. I wonder if they are following laws regarding overboard discharge. Anyone hear of this in NY on the Hudson? I know that sewage discharge is illegal in US waters and many other countries, but what about these sinks?
I dealt the boat already, but I am thinking of having the new owner install sea cocks over those thru-hulls.
Thanks,
Andrew
I dealt the boat already, but I am thinking of having the new owner install sea cocks over those thru-hulls.
Thanks,
Andrew
This discussion leads me to wonder why the galley sink drain is valved, but the head sink is not.
Boat is a 36-2 Pearson. Double sink, 1.5 inch pipe with shut off valve. Have sanitation hose. WM didn't have and the guy recommended the white plastic. And just replacing with trident like is there.
Btw bathroom sink is above however I put a shut off valve in line
Btw bathroom sink is above however I put a shut off valve in line
I am really not understanding what this yard did to your boat? What exactly was cut and sealed with silicon? I have heard of areas where they restrict the discharge of "gray water." Gray water is the water from a shower or a sink or the bilge. Perhaps this area has that restriction? But PLEASE don't tell me they plugged the through hulls in your boat with silicon only or it sounds like you will be sinking soon.
Woody, the head sink thru hull is above the waterline by no more than 4". Doesn't take much healing to starboard to put it under.
thats way there is no sea cock they just didn't do that back then and i don't know if they do it now or not...i would put a bronze through hull fitting on the hull and a sea cock so if i wanted to do it like peggy suggest i would and also if you put a sea cock in you can run it in the closed position so when healing you don't have to worry about the ingress of water in the head sink
I assume the theory is that as long as the sink remains above sea level, sea water won't back up into the sink. I suppose you'd have to be pretty close to capsize for that to happen. Like you, I will plumb in a valve and Y to enable Peggy's suggestion of the option of doing a final fresh water flush using the sink drain.