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Old 09-01-2010, 02:41 PM   #21
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1969 18' Caravel
portland , Oregon
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Hi Chuck,
I just got back from my neighborhood hardware store with a $4.95 - 3" sanitary T that connects to a 2" line on the side. I cut 1/2" off the top and the fit is almost exactly (if not exactly) what the original Thetford collector was. The only difference with the original is the lack of the mounting plate. Inland RV's collector has the same issue. They suggest to either remove the rubber gasket and glue the collector on or screw it on with screws and sealant through the sides. I plan on screwing it through the side in case it ever needs to be replaced.
The 2" gray water line is the same as the original collector.
The only real difference between this fix and Inland Rv's is that the bottom section that the hose attaches to will end up being a couple of inches lower than the original Thetford collector.
There is a bayonet fitting from the out-of-doors mart made for ABS with an outside diameter of 3.5" (this is standard 3" ABS). I plan on cutting off another 1/2" from the bottom of the sanitary T, adding just enough 3" ABS to attach the bayonet fitting and being done with the entire problem for around $15. Unless there is some reason that 2" difference in ground clearance matters, this seems like a proper solution to the problem.
Because they sell the 3" sanitary T with two 2" inputs this solution would most likely work for your trailer.
However, if I was you, I would probably order the 3.5" bayonet fitting, use a multi-tool, or pull saw and then a hand file and see if you can make the bayonet fit over your existing collector. Nothing to loose but a little bit of time. I'm pretty confident the sanitary T fix will work and if you go that route you'll already have the bayonet fitting if cutting the lugs doesn't work.
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Old 09-01-2010, 04:22 PM   #22
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yeah, I think thats the best idea. I just measured it...just about 3.5 OD.

what confused me is that the bayonet fitting says right on the label: 3" O.D.

methinks they're mistaken. (or are they?)

standard "3"" pipe is 3" on the INside; and as you said, 3.5 OUTside.

Instead of a regular "sanitary T", which most often have all "hub" (female) connections, you might look for a "sanitary street tee"...which has hub on one end, and "street" or slip on the other. (like a straight piece of pipe) then you could just cut it anywhere you need, and glue-on the bayonet ring.
might also consider putting on a valterra type, instead. the Thetfords are more rugged...but the valterra slinky fittings are more readily available...on the shelf at any Walmart. (for emergencies).

can't find abs pipe in hardware stores around here, as its not "code" for houses. everything is pvc. but the sizes are the same.
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