Tank help please!!!!!

John316 · August 28, 2009, 07:11:37 AM

Okay, 13 days until departure.

We are trying to figure out how to attach our toilet to the black tank. We had purchased a rubber grommet, and were planning on using that. The problem is our tank walls are a half inch thick, and the grommet is designed for eighth inch walls.

How do we attach?

I would greatly appreciate any help!!!

God bless,

John

TomC · August 28, 2009, 07:13:08 AM

Need pictures

luvrbus · August 28, 2009, 07:41:33 AM

John, are the tanks Poly or ABS I may have a screw in fitting for the ABS I can ship to you

good luck

John316 · August 28, 2009, 07:44:51 AM

So how do you all do it?

The first one is of the rubber grommet that isn't the right size. Our tank is thicker than that grommet allows.

God bless,

John

boogiethecat · August 28, 2009, 07:47:02 AM

I used a plastic spin-weld fitting instead of the grommet. Personally I believe it to be a better seal, and from there used standard screw-on ABS fittings.
Then it doesn't matter what your tank size is...

cody · August 28, 2009, 07:47:21 AM

Do they make a screw fitting for the 4 inch inlets that you can slide into the hole with a gasket and then tighten a nut or something on the backside cause a person could almost get their hand into the hole to tighten it, that would seem the most secure way but I've never seen one, I'm getting ready to fight the same battle but mine are the black abs tanks with the 1/8 walls.

John316 · August 28, 2009, 07:51:43 AM

We will try this.

God bless,

John

Jeremy · August 28, 2009, 07:52:55 AM

Could you not just machine a recess into the tank? I'd expect the material the tank is made from could be worked with regular tools - perhaps a router if you've got access, or simply a carefully-used angle-grinder with a sanding disc (my universal tool for numerous jobs, and surprisingly delicate when required).

Jeremy

John316 · August 28, 2009, 07:54:10 AM

Here is another that shows roughly where the pipe will enter.

Thanks.

God bless,

John

luvrbus · August 28, 2009, 07:55:40 AM

John, measure you opening for me and I'll see if I have anything that will work for you

good luck

John316 · August 28, 2009, 07:59:33 AM

This one shows the rubber grommet that we have, but is too small. If it allowed a thicker wall, we would be good.

The company that made the tanks for us recommended against spin welding. He said that with a tank that size, if you aren't a pro, don't do it. He said that the rubber is better, because it allows some flex, and isn't very ridged.

Cody, we might be stuck doing a bulkhead for the toilet. We will see.

God bless,

John

Clifford, our posts just crossed. Out toilet pipe is going to be 3". That means that we need the grommet to be 3.25 (for a tight fit). We also have three vents that we were going to put in the same way. Those would be 1.5" so we would need. 1.75 (for a tight fit).

John316 · August 28, 2009, 08:01:15 AM

Here is the last one. This one shows that the tank (sorry I forgot to put a tape measure in the pic) is .5" thick.

Thanks a lot. I think that we will probably be overnighting whatever we figure out.

God bless,

John

Len Silva · August 28, 2009, 08:03:07 AM

When I built my plywood/fiberglass tanks years ago, I just used an ordinary toilet flange siliconed to the tank and held with stainless screws and nuts. I was able to reach through the flange to hold the nuts while I tightened the screws. A short length of pipe and a rubber coupling will put you one the road in no time.

luvrbus · August 28, 2009, 08:19:08 AM

John, everything I have is ABS glue on fittings for ABS tanks sorry

good luck

John316 · August 28, 2009, 08:20:47 AM

Thanks for the try Clifford. I appreciate it.

Anybody else? How did you connect to your tanks?

God bless,

John

Tank help please!!!!!

cody