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Old 04-11-2011, 05:41 AM   #15
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Originally Posted by marzboy View Post
I am useing these Ronco Plastics - Marine Water Tanks, RV Water Tank, Auto Detail Tanks, Water Tanks for my grey and black tanks. Uwe from Area 63 suggested them.
I'm using the same tank from Ronco. I have two gray and one black tank. The total was around $500 to my door.


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Old 04-11-2011, 08:15 AM   #16
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Edge and corner thickness is kind of critical because this is often where they receive mechanical stress. ABS vacuum molded tanks are thinner at corners and edges because they are drawn over a mold while being heated. Roto-molded tanks are actually thicker at corners and edges because they are literally rotated in a mold.

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Old 04-14-2011, 03:19 PM   #17
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I am having a difficult time with this ABS versus Polyethylene tank choice. Today I am really thinking to go with poly... However, I really want to use the rubber fittings rather than order the tanks with fittings spin-welded.

You are supposed to use a butyl caulk with the rubber fitting.

Anybody have problems with the rubber fittings leaking?

In my design I will have a 5" deep tank and a 6" deep tank. When the 6" deep tank is full the water height will be above the 5" deep tank. In other words I will 'over-fill' the 5" tank which will put the rubber fitting 'under water' by a 1" water column, 2" if water backs up into the shower pan. The tank guys say 'no problemo' but I don't know.

Anybody had a bad experience with the rubber fittings?

Thanks, John H
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Old 04-14-2011, 04:18 PM   #18
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There are more leak resistant bulkhead fittings available. Here's one supplier:

Polypropylene Bulkhead Tank Fitting with EPDM Gaskets | U.S. Plastic Corp.

And some slightly heavier ones from the same place:

Hayward® BFA Series Industrial Bulkhead Fittings | U.S. Plastic Corp.

You could also try a place that sells spray equipment to farmers. They'll have similar fittings, reasonable prices, and are usually willing to work in small quantities.
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Old 04-14-2011, 05:40 PM   #19
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So is there a sealant we can use with the poly . . . And/or will the butyl caulk be "water tight"?

And a separate question (for Jammer):
Those fittings look great but how do you get the piece that goes inside the tank . . . in the tank (w/out drilling a larger hole somewhere else (sounds like a "dumb question")?

Seems like it would only work for small connections - where you could install the inside piece through the large drain hole.

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Old 04-20-2012, 01:58 PM   #20
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How will the weather affect these tanks?

My factory poly black tank is in an enclosure with insulation and a heat source. From the pictures I have seen, the ABS will be exposed on the bottom. Is there a freeze risk?

I am about to order a black and a gray, not sure which way to usual.
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Old 04-20-2012, 05:00 PM   #21
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Just remember that the polyethelene group of plastics (HDPE, LDPE) are so chemically resistant that they are virtually impossible to solvent weld (glue). This material is commonly used in labs and research facilities where corrosive materials may be used. Connections may be made mechanically by bulkhead fittings or by heat fusion only. Strength wise for all practical purposes they are the same. The polyethelene may be a bit more brittle. If you were looking for a replacement for a fresh water tank I would suggest the polyethelene, otherwise use the ABS.

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