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Help me find 1.5" OD Scuppers

Old 03-07-2020, 08:08 PM
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Default Help me find 1.5" OD Scuppers

I'm restoring a 1990 Mako 171. I've removed the old broken scupper tube drains from the transom and can't find replacements. The holes in the transom are 1.5" in diameter and 2.25" long. Everything I find is too big or too small, usually 1.25" or 2" in diameter.

Any help is appreciated. I've searched everywhere. I can't figure out if it's an odd size, or I'm using the wrong search criteria. Scuppers, transom drains, motorwell drains, helm drains, transom drain tubes, etc. Nothing. I'm desperate at this point.
Old 03-08-2020, 05:22 AM
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I’d either find brass tubing to fit and use sealant, or glass in the larger holes and re drill smaller ones. eBay has a lot of random tubing sizes in small pieces. I’d check there first.
Old 03-08-2020, 06:07 AM
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Gemlux has a ton. FInd something close then modify the hole to get a perfect fit.
Old 03-08-2020, 07:02 AM
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Originally Posted by 270Handiman View Post
Gemlux has a ton. FInd something close then modify the hole to get a perfect fit.
They have two different size scuppers. Neither fit. Both sizes are on my coffee table waiting to be returned.
Old 03-08-2020, 07:15 AM
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I have searched:
Ebay
Amazon
Wholesale Marine
Jamestown Distributors
Great Lakes Skipper
Perko
Attwood
Accon
Gemlux

Cannot find one that fits 1.5 inch hole.

Here are some options for 1-7/8" hole. That's only 3/16" material to work out carefully with a wood rasp all the way around.

https://www.perko.com/images/catalog..._pdf/R-104.pdf


Last edited by polarred21; 03-08-2020 at 07:22 AM.
Old 03-08-2020, 07:29 AM
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If I understand the problem correctly (and you may know this) but I believe you are looking for size 1-1/4” npt or nps, which has a “drill size” of 1.5”. Having said that I think technically drill size for one or the other is 1-33/64”. I think you can find in groco catalog but may be wrong about all of this.
Old 03-09-2020, 03:05 PM
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Originally Posted by Mtwhoosh View Post
If I understand the problem correctly (and you may know this) but I believe you are looking for size 1-1/4” npt or nps, which has a “drill size” of 1.5”. Having said that I think technically drill size for one or the other is 1-33/64”. I think you can find in groco catalog but may be wrong about all of this.

interesting point. I wonder if some of what I have found that are 1-1/4 are actually 1-1/4 NPT?
Old 03-24-2020, 01:52 PM
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Just to update those who wrote in.
I have tried 4-5 different scuppers from 1-1/4OD and up and have found nothing that fits properly. I have a random piece of 1.5" pvc pipe for a sink drain that fits absolutely perfect. I'm thinking my only option may be to go to the fabricator that made my fuel tank and see if he can make custom scuppers for me. Not at all what I was hoping to do. I'm at a loss for ideas at this point.
Old 03-24-2020, 02:05 PM
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did you ever put a picture up? my guess is the hole was buggered up
Old 03-24-2020, 05:57 PM
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Here are pics of the scuppers. The plastic pipe is exactly 1.5" diameter. Don't know why they are sideways but you get the point.




Old 03-24-2020, 06:59 PM
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Is drilling it our to a 2" an option?
Old 03-24-2020, 07:12 PM
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Originally Posted by surv View Post
Is drilling it our to a 2" an option?
No. there's not enough room. You can see how little room there is in one of the pics.
Old 03-25-2020, 04:03 AM
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So the originals were plastic? No nut on the back and slid into each other?
No hose attaches to it?
maybe th marine?

https://thmarinesupplies.com/collect...nt=48676219279

Old 03-25-2020, 06:03 AM
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Originally Posted by Raybo Marine NY View Post
So the originals were plastic? No nut on the back and slid into each other?
No hose attaches to it?
maybe th marine?

https://thmarinesupplies.com/collect...nt=48676219279
that calls for a 1-7/8 hole.
Old 03-25-2020, 06:31 AM
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Maybe epoxy some 1 1/4" ID (which is 1 5/8" OD) pvc in place and put the flapper back on the outside. You would have to seal the core before doing so.
Old 03-25-2020, 10:28 AM
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Originally Posted by Sumguy View Post
that calls for a 1-7/8 hole.
well there are different sizes and you can always increase the size of the existing hole

can you answer the rest of the question? were they plastic that slid into each other?
no hoses attached?
Old 03-25-2020, 12:11 PM
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Originally Posted by Raybo Marine NY View Post
well there are different sizes and you can always increase the size of the existing hole

can you answer the rest of the question? were they plastic that slid into each other?
no hoses attached?
I don't think I can increase the current hole size because there's not enough room between the deck and bottom of the hole on the inside of the transom.
The old ones were two pieces of plastic that slid into each other with rubber flaps screwed into the transom on the outside.
Old 03-25-2020, 12:36 PM
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Go get some epoxy, e-glass, and thin plastic sheet. Wrap that pvc pipe with the plastic and use the pipe to mold you some scupper tubes. When you install the tubes, use some epoxy and wood flour to make a peanut butter.

I use this method to make my own 2" scuppers, but have all the room I need to fiberglass them in. Your picture looks like you don't have good access.... maybe you need to find a smaller diameter pipe and build the tubes so you could slide them in from the outside. Then you can fiberglass them in on the outside.

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-dave
Old 03-25-2020, 01:14 PM
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When you cast or weld fittings like Gemlux scuppers, they will vary in diameter and roundness. No 2 1 1/2" are exactly the same due to the cooling process on alloys that vary in composition and shrink differently when quenched. That's why you machine them in a lathe after any high heat process if you want tighter tolerances.

Saying that you can either take them to a machine shop or enlarge the fiberglass and caulk the small difference with 4200.

This is a drain that should be reinstalled to fit standard replacement hoses, so its not like you are trying to match critical lash measurements on two gear faces.

Get your round rasp out, work on the hole 1 minute, caulk it, and be happy.
Old 03-25-2020, 01:19 PM
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look up thin walled brass tubing
all the sleeves sold for boats are not bronze, they are brass.
You will just have to buy a length of it, flange both sides of the tube before you cut anything. then cut each side a little longer than you need, then install like any other application.
The larger flanging tool should work if not you may have to find an old bearing to use or look up how Tom Clark says to anneal and flange it I think he explains how to do it without a tool.

something like this: https://tdibrass.com/products/1-5-di...BoCutQQAvD_BwE

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