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Old 28-02-2013, 05:06   #1
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Hello

I'm plumbing a double sink drain. I noticed this photo in someones blog of their recent drain job.
What is the black fitting called at the top of hose?
The hose barb end of the fitting must be 1-1/2 as thats the hose size.

Thanks

Also, what is the fitting on the seacock called? Should teflon tape be used?

I can't find either of these fittings locally here in Key West and finding them online without knowing what they are called has left me blank.
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Old 28-02-2013, 05:16   #2
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Re: What is the Black Fitting in this Sink Drain?

It appears to be an adapter from threaded fitting to hose barb. I believe these are readily available in PVC from places like Home Depot or Lowes. I don't know of any other specific name. These stores also have double sink drain fittings that slide for adjustment for distance variance between the sink drains and combine the two for one drain.
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Old 28-02-2013, 05:34   #3
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Re: What is the Black Fitting in this Sink Drain?

That picture shows a groco seacock. Miy groco seacocks are not standard NPT thread like most home depot fittings are. Check your seacock and get a proper tailpiece Most marine suppiers have them. No PVC below the water line. I think defenders has a sink drain tailpiece that is correct. Sink drains are usually straight thread also.
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Old 28-02-2013, 05:42   #4
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Re: What is the Black Fitting in this Sink Drain?

A Tailpiece installs from your sink strainer to the waste drain.
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Old 28-02-2013, 05:44   #5
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Re: What is the Black Fitting in this Sink Drain?

Quote:
Originally Posted by sabray View Post
That picture shows a groco seacock. Miy groco seacocks are not standard NPT thread like most home depot fittings are. Check your seacock and get a proper tailpiece Most marine suppiers have them. No PVC below the water line. I think defenders has a sink drain tailpiece that is correct. Sink drains are usually straight thread also.
I think this is it. Did not think of looking at Defender.
This fitting can be used above and below the water line.

Forespar Marelon Straight Tailpipe / Hose Connector

Forespar Marelon Straight Tailpipe / Hose Connector
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Old 28-02-2013, 05:58   #6
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Re: What is the Black Fitting in this Sink Drain?

EOTR..... You sure Cuban Joe's (KW Marine Hardware on Caroline) doesn't have it? There is a lot of stuff in back that you have to ask for... Bring in a picture to the counter!

Also..... Household sink bowls (drains) do not have pipe threads; they are straight. You cannot mix the two threads with any certainty of being leak free. You need a tailpiece like this one:


NEVER use the zinc tailpiece nut that most sink bowls ship with.. ALWAYS use a brass nut!
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Old 28-02-2013, 06:05   #7
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Re: What is the Black Fitting in this Sink Drain?

That looks better but on some seacocks there is a washer and seat that seals out the water. you cant just screw a straight thread on and expect it to seal. I dont like using plastics with bronze/metal though in straight thread it probably is less important. they react differently to temperature and this can cause problems. fine for attaching at the sink but at the thru hull I would be extra careful. I hate sink plumbing
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Old 28-02-2013, 06:07   #8
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I had to replace two sink drains/strainers on our boat. I could not find those barb fittings at home depot, lowes, or menards (midwest u.s. big box store). Finally found them on eBay by searching the phrase "rv sink". I even tried a plumbing supply store in the industrial section of town, they looked at me like I needed a part for my space ship.
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Old 28-02-2013, 12:03   #9
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Re: What is the Black Fitting in this Sink Drain?

Wow!
So much great help, thanks all.

I was thinking about one of these drain kits as I have plenty room for one, my waterline is only about 2 inches below sink bottoms so I am worried about a leak at a joint. I would buy one but I cant find any online reviews.

http://www.defender.com/product.jsp?...5300&id=840874

Anyone have any experience with one of these kits?


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Old 28-02-2013, 12:12   #10
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Re: What is the Black Fitting in this Sink Drain?

1000's of boats are using that sink drain system. My Catalina 380 used it and My Mahe has the same fittings. I have never had any issues with them.
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Old 28-02-2013, 12:20   #11
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Re: What is the Black Fitting in this Sink Drain?

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1000's of boats are using that sink drain system. My Catalina 380 used it and My Mahe has the same fittings. I have never had any issues with them.
Does your waterline sit in those pipes?
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Old 28-02-2013, 12:33   #12
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Re: What is the Black Fitting in this Sink Drain?

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Does your waterline sit in those pipes?
No, never had a sink drain that low even with the rail in the water
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Old 28-02-2013, 14:48   #13
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Re: What is the Black Fitting in this Sink Drain?

I must confess that I have some PVC below the waterline. There's a lot to take into account with risk management....... pressure, unsupported lengths, vibration, quality of materials, location. Some may disagree, but I'm not standing with the blanket condemnation of "no PVC below the waterline".
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Old 28-02-2013, 17:47   #14
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Re: What is the Black Fitting in this Sink Drain?

Since I'm new to boats, I have to ask - Why no PVC below the water line?

Best regards,

Mike
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Old 28-02-2013, 18:05   #15
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Re: What is the Black Fitting in this Sink Drain?

For my boat there is no pvc below the waterline attached to a thruhull so that a failure of the pvc could sink the boat. One problem I have seen. A tightened pvc schedule 40 fitting that cracked because it was overtightened or cracked because it was so tight that when the temperature changed and dissimilar materials expanded or shrank at a different rate it cracked. For an extra 20 bucks you can avoid that problem. Maybe a place or 2 where pvc could get someone by.
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