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Old 01-12-2016, 07:49 PM   #1
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Need help finding flange

Hi everybody,

Longtime reader-first time poster. A hose flange for the fresh water tank broke. I bought a replacment that is apparently polyethelyne but it will not adhere to the tank even with epoxy. I've been to two local RV supply stores , Home Depot and online and nobody has an ABS replacement. The tank is black so I assume it is ABS. I find it hard to believe that this is not a readily available part. Does anyone know where I can get one? Attached is a picture of the part-it's the greenish part. Thanks
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Old 01-12-2016, 07:53 PM   #2
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Find someone local who does plastic welding. I thought those were spun on but could be wrong.
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Old 01-12-2016, 08:03 PM   #3
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I think they are spun welded. Makes no sense to mate two unlike materials together. So much easier to use ABS on ABS. I'll try and google "plastic welder". Thanks for your quick reply.
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Old 01-12-2016, 08:07 PM   #4
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There is a proper glue to do that....it's available at HD...read the glue cans
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Old 01-12-2016, 08:28 PM   #5
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I used Loctite epoxy for plastic and it failed miserably. But your response prompted me to look at Loctite's website again and I found a glue that will bond polyethylene and other hard to bond plastics. So that might work. Thanks!
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Old 01-13-2016, 09:39 AM   #6
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It's odd that the fresh water tank is black. They're usually translucent.

If it's black it's most likely ABS, but could be HDPE.
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Old 01-13-2016, 10:03 AM   #7
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Quote:
Originally Posted by Bama Rambler View Post
It's odd that the fresh water tank is black. They're usually translucent.

If it's black it's most likely ABS, but could be HDPE.
Agree 100% must be a Replacement Tank,F/R uses White/translucent tanks that have Spun welded or cast areas for their fitting's! Don't Drink Black Tank Water! Youroo!!
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Old 01-13-2016, 10:20 AM   #8
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I have never found a glue or epoxy that will bond any density of polyethylene to ABS. You might get something to hold for awhile, it will eventually fail.

You need to find out if the tank is Poly or ABS. Try a little ABS pipe cement somewhere on the tank. If it starts to melt the tank ,its ABS. Just because its black means nothing.

Valterra makes ABS fresh water tanks that are black. The logic is algae can not grow in them due to no light being able to penetrate the tank. The bungs however are cast into the tank and then tapped.
Fresh Water Tanks Archives - Valterra.com | Valterra.com

When you start talking buying plastic welders or spin fitting collets, you're already in new tank price territory if you play your cards right.
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Old 01-13-2016, 01:23 PM   #9
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If you can plug the hole down at the bottom, go down from the top. Had that done with a holding tank pick up on a boat I had. Easier all around and if it 'springs' a leak, way less mess.
Good luck.
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Old 01-13-2016, 02:18 PM   #10
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Tank Repair

From pic, looks like flat piece of tank wall is still attached to fitting collar.
So,
Determine what type of material tank is.
See if local RV shop has about a 3x3 scrap piece you can have.
Drill hole in center of 3x3 large enough for fitting to project through into tank.
Use appropriate glue to bond remnant of tank that is still attached to screw-in fitting onto the 3x3.
Use same glue then to bond 3x3 to tank with
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