What hose should I use for a sink drain?

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Ward H

Ward H

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Nov 7, 2011
3,774
Catalina 30 Mk II Cedar Creek, Bayville NJ
On my O'day 25 I have a drain line from the sink to a thru hull. I saw this Trident PVC Tubing - 3/4 Inch http://www.defender.com/product.jsp?path=-1|51|106370|315127&id=106581 but it says not for below water line thru hull connections. That looks like what is on there now but I know that does not mean it is correct.

Then I found Trident Vac XHD Bilge / Live Well Hose - 3/4 Inch http://www.defender.com/product.jsp?path=-1|51|106370|315129&id=1404113.

It does not say not to use it below the waterline. Is this what I need for the sink drain to thru hull?

Thanks
 
N

navigator97

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May 24, 2004
470
Hunter 33.5 Portsmouth, RI
I agree with Joe (above) that the use of Polyester reinforced PVC would be a good choice. That is what I used. You don't want the hose to burst and have seawater flood the boat when the sea cock is opened. Of course that sea cock should always be closed when you leave the boat - just in case.
 
Sumner

Sumner

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Jan 31, 2009
5,254
Macgregor & Endeavour 26S and 37 Utah's Canyon Country
Personally I wouldn't use the 162 if the thru-hull is below the water line. It isn't recommended for that....

http://www.defender.com/product.jsp?path=-1|51|106370|315127&id=106656

I'd use the 148 ....

http://www.defender.com/product.jsp?path=-1|51|106370|315126&id=150703

...as it is approved for that. We just bough a bunch of that for different applications on the boat. Bought the short lengths from Defender and Jamestown had good prices on 50 foot rolls so bought two sizes from them that we needed.

Trident and Shields use the same number system 148, 162, etc. and I don't know if others also do. You aren't going to need much for the sink so I'd bite the bullet and buy something that is recommended for below the water line if that is the case for you,

Sum

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Our Endeavour 37

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Joe

Joe

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Jun 1, 2004
8,158
Catalina 27 Mission Bay, San Diego
The 148 is a sanitation hose.. it's hard to work with and since you don't need it... why make life more difficult. If the under the waterline disclaimer scares you then I would choose the Trident 161.... at least you can cut it flush, fit it on barbed fitting easily and it will flex around a corner.... the 148 does none of those things.
 
thinwater

thinwater

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Mar 26, 2011
3,669
Corsair F-24 MK I Deale, MD
Yes, the sanitation hose is stiff, but the down side of the clear vinyl hoses (including the one with fibers) is that they kink very easily (not immediately, but sneakily the next week), making a nice clog spot. Just make sure you don't ask it to turn sharply. Better, use something ribbed.
 
Sumner

Sumner

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Jan 31, 2009
5,254
Macgregor & Endeavour 26S and 37 Utah's Canyon Country
Joe said:
The 148 is a sanitation hose.. it's hard to work with and since you don't need it... why make life more difficult.
Click to expand
The 148....



...isn't as stiff as some of the black older stuff. The 3/4 has a 3 inch bend radius so is pretty flexible....

http://www.go2marine.com/product/164646F/shields-148-series-vac-extra-heavy-duty-fda-by-inch.html

I just used some of the 1 inch on a very tight bend behind the head with no problem.

I'm using the 1 1/8 inch for the bilge pump runs on the Endeavour as there is a lot of vertical rise to them and they are long. I feel the other bilge hose with the ridges is just to restrictive since it isn't smooth inside for our application on the pumps. The 148 is used for sanitation, not the best hose, but is made for other applications also....

This hose is primarily used for bilge pump intake and discharge, drains (sinks, shower, and scupper), livewell intake and drain, potable water tank fill, and sanitation (toilet to holding tank, intake, self draining lines vent and pump out).
Click to expand
For his sink run I doubt it is $10 more to use this hose and it will have a longer life span most likely,

Sum
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============================[/FONT]

Our Endeavour 37

Our MacGregor 26-S Pages

Our Trips to Utah, Idaho, Canada, Florida

Mac-Venture Links
 
RichH

RichH

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Feb 14, 2005
4,773
Tayana 37 cutter; I20/M20 SCOWS Worton Creek, MD
The only hose that you should be using below the waterline and connected to a through-hull, etc. is *wire reinforced* hose.
 
Sailvayu

Sailvayu

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Jul 25, 2007
320
-Irwin -Citation 40 Wilmington, NC
As a surveyor I look at many hoses almost daily. What have I learned? The sanitation hose is fine, holds up a long time and I have yet to see a failure. It is a vinyl plastic and remains flexible for a long time. The wire reinforced hoses are good and have a high burst pressure but I write them up all the time for dry rot and the wire rusting through. This is a sink drain not under pressure or subject to high temperatures or hot gases or chemicals. I would say do not over think it, use a good quality hose, the sanitation hose is fine, as is the wire reinforced. If you want to know what sinks boats it is very old hose, corroded fittings and broken clamps.
Use what helps you sleep at night and go sailing!

Capt. Wayne Canning, AMS
www.projectboatzen.com
 
Ward H

Ward H

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Nov 7, 2011
3,774
Catalina 30 Mk II Cedar Creek, Bayville NJ
The hose run is almost straight down, no more than 3'. I am changing out the sea cock and resetting the thru hull so figured the hose should be changed too.
Price is not an issue for that short length. Will probably stop by WM and get the hose Joe and Merlin recomends or order Sum's suggestion on my next Defender order.

Thanks
 
S

shannon28

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Jan 15, 2012
20
Dyer Dhow, Cats Paw 10 ft, 12 ft Montpelier, VT
Don't use the Series 162 Polyester Reinforced Clear PVC Tubing or similar tubing. It is not designed for below the water line applications.

West Marine has at least two hoses for your application. They are the Shields 135 and 148. As several have mentioned the 148 is considered a sanitation hose but will work well for a drain application. My first choice would be the Shields 135.

But please don't use the Series 162 Polyester Reinforced Clear PVC Tubing or similar tubing, it's really designed for internal water lines only.
 
Joe

Joe

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Jun 1, 2004
8,158
Catalina 27 Mission Bay, San Diego
okay....... the west marine ad doesn't include the "under the waterline" disclaimer for shields 162..... whereas defender does... and probably a few others..... but in the non pressure application to a bronze, barbed ball valve nipple and if it's double clamped....it's fine. The respective valves are closed when not in use...

BTW.. I realize the disclaimer exists....... but.... can you explain "WHY" it isn't recommended for under the waterline applications. Just saying "it's not recommended..." without explaining why piques my interest.
 
Merlin Clark

Merlin Clark

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Oct 26, 2005
2,057
- - Satellite Beach, FL.
Probably because they make more money on the other stuff Joe!
I've used the reinforced tygon tubing for a couple of decades now with no failures. Sanitation hose is good stuff for it's intended use, the movement of waste and not allowing odors to penetrate.
 
S

shannon28

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Jan 15, 2012
20
Dyer Dhow, Cats Paw 10 ft, 12 ft Montpelier, VT
Joe - I respectfully disagree with your assessment.

1. I have a real problem when it comes to holes in my hull, always have.

2. Shield's list the 162 as , "Not recommended for below the water line use." That recommendation isn't Defender's West's or Hamilton's description, but Shield's.

3. Regarding the comment about making more money on the more expensive hose. It's just as likely that a hose mfg makes more money on the clear vinyl stuff. Either way that's clear speculation.

4. The difference in cost for a 3 or 4 foot piece is miniscule, especially when compared to the 148 which has some substance to it.

5. The clear vinyl (poly reinforced) hose material is soft and easily cut or abraded. The real issue is impact and wear.

6. I've always been willing to bite the bullet and go with high quality wire or specialized reinforced hoses on my boats. I always slept better, especially offshore.

Ward H - forums are all about advice, my advice is spend the few extra dollars and go with the 148.
 
S

shannon28

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Jan 15, 2012
20
Dyer Dhow, Cats Paw 10 ft, 12 ft Montpelier, VT
Tkanzler - Thanks for the reference, my response is directed solely to the Shields table. The table is interesting and confusing at the same time.

1. From the chart you provided, drain line below water line is rated good while toilet water inlet is rated excellent. Can't see any major difference in basic function as both are below the waterline.

2. There is also the following: http://www.teleflexmarine.com/products/hose/potable-water-2/series162/. Please note the distinction between excellent and good.

Designed to give Excellent Service for:
• Non-Pressurized Supply
•Pressurized Supply: hot
• Pressurized Supply: cold

Designed to give Good Service in normal Applications:
• Water Tank Fill
• Drain Lines Below Water Line
• Drain Lines To Sump or Above Water Line
• Water Tank Vent


3. I called Hamilton Marine and asked about the 162 and was told, that according the information Shields provides them, it was not recommended below the waterline.

I'm not sure GOOD under normal conditions (whatever that means) is GOOD enough when it comes to holes in your hull. Having looked at the table my advise is still don't use Shields 162 for below the waterline applications.
 
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