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Old 08-05-2018, 10:03 AM   #1
Mini-Skoolie
 
Join Date: Aug 2018
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Black water tank connection

Hey guys were getting started on our conversions and things have been going pretty good. Were planning the tanks out now and we have an old 25 gallon that we want to use for our black water tank. My question is how can I connect 3 pvc to the tank with out plactic welding? Ive found some flange options but not really gonna be a good seal on the bottom for the drain. Just wondering what my options are
Thanks
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Old 08-05-2018, 10:20 AM   #2
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Uniseal or spin-weld fitting.

Spin-weld is for polyethylene only and requires a special tool ($100).

The larger Uniseal's work well but can be a pain to assemble. I have used a roundover bit in a router to ease the end of the pipe and make it easier to assemble. Also, I use Windex as a lube.
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Old 08-05-2018, 04:21 PM   #3
Mini-Skoolie
 
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Ok I saw the Uni seal on amazon and was sure how they worked. Do they just stick on with an adhesive or what is used for the attachment?
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Old 08-05-2018, 04:35 PM   #4
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Quote:
Originally Posted by Dmaxx85 View Post
Ok I saw the Uni seal on amazon and was sure how they worked. Do they just stick on with an adhesive or what is used for the attachment?
The uniseal goes through the hole in the tank. Then the pipe is pressed into the seal. The pipe is just slightly larger than the opening in the seal. When you force the pipe in it compresses the seal.

So:

Drill hole

Insert uniseal

Lubricate

Insert pipe
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Old 08-05-2018, 04:39 PM   #5
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Gotta love YouTube :

https://www.google.com/url?sa=t&sour...N8ZFOD4xbU2nov
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Old 08-05-2018, 04:44 PM   #6
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OK... The link doesn't work.

Google brstv uniseal and you will find a video showing Uniseal installation.
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Old 08-14-2018, 06:01 PM   #7
Mini-Skoolie
 
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What would it take to weld a flange on the bottom of this plastic tank?
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