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Old 07-28-2008, 10:03 PM   #11
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Re: Holding Tank Mounting

Yes I did, and by all means get them!! I got one 3" for the toilet pipe, and three 1.5" for the gray inlet and a vent stack for each of the two tanks. You'll need a couple of hole saws, but these things are easy enough to cut through. I first got the tanks where I wanted them, then started with the hole saw, but once the pilot hole was started I pulled the tank out of the way, drilled the hole through the cargo deck floor first, then drilled the hole in the tank since the pilot hole was already started.



The key here, was to NOT have the tanks hard mounted, so I could slide them back and forth on their mounts.



The image above is the cut-out for the 3" toilet pipe, and those slip seals work really well, if you make the right size hole they will fit in there nice & snug, then the pipes just slip down into them and they fit snug too...



Next came the 1.5" hole for the vent stack, note you can see the floor cut-out material above the tank...



Slide the tank back into place and insert the piping...



The gray tank used two 1.5" slip gaskets, one for inlet and one for vent stack.... BTW, you can see the holes in the floor inside the cargo bay in this picture...





I also got the waste valves from somewhere on ebay too...



I sent the two vent stacks up to the roof, one straight up and the other I had to put a couple of 90 elbows in it. I did hower, run them up and over the top of the cargo bay so they wouldn't get in the way of things....



Those pipes are embedded in an 8" wall that holds all the bathroom plumbing, the 2 vent stacks, and most of the electrical feeds that go up that side of the bus. The holes were eventually filled in with "Great Stuff" after everything was run...





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Old 07-28-2008, 10:11 PM   #12
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Re: Holding Tank Mounting

Ummm, as an addendum to the above, I made all the holes along the outside edges of the tanks, this was to keep the middle area of my cargo bay as "pipe free" as I could.

Also, once you work those slip gaskets/grommets into the top of the tanks, you may have trouble sliding the tank back into place. I wound up loosening the outside mounting struts so that there was enough clearance from the top of the tank to the bottom of the cargo deck floor to slide them into place, then re-tighten the strut back up to the deck...
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Old 07-28-2008, 10:22 PM   #13
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Re: Holding Tank Mounting

Glad to here those rubber grommets work well, thx for the info.
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Old 07-29-2008, 09:37 PM   #14
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Re: Holding Tank Mounting

I was tempted to tie the two vents into one stack, but wasn't sure about that. Hindsight being what it is, the next time around I'll use a single vent stack. I used two because I was emulating the way my TT was built, and they used seperate stacks. Be that as it may, it works just fine.

As for going through the roof, that was my choice. I thought about venting out the side a foot or two above the tanks, but then the thought of sewer oders wafting up into the window made me re-think that.
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Old 08-09-2008, 08:20 PM   #15
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Re: Holding Tank Mounting

i like the staps, i used old L brakets with metal straps and a diesel tank that had been sitting in the desert for ten years. barely fit and drilling holes in the frame was hard
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Old 09-16-2008, 10:45 PM   #16
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Re: Holding Tank Mounting

Went camping this week and the tanks on the ladder hangers worked out fine. There are 8 hangers per tank. We did not have any need to haul around a full tank any farther than the dump site but we had no problems. (much to our relief)
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Old 09-17-2008, 12:38 PM   #17
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Re: Holding Tank Mounting

I believe that another purpose of the vent is to allow air into the tank. If waste decomposes without air it STINKS much worse! I suspect using a trap with water or other "one way valve" will make things unpleasant if you're using the bus for any length of time. A proper vent is part of the system.
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Old 09-17-2008, 03:23 PM   #18
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Re: Holding Tank Mounting

Quote:
Originally Posted by wdbowers
Went camping this week and the tanks on the ladder hangers worked out fine. There are 8 hangers per tank. We did not have any need to haul around a full tank any farther than the dump site but we had no problems. (much to our relief)
Good to hear. Thanks for the update.
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