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Old 08-31-2010, 08:20 PM   #15
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1969 18' Caravel
portland , Oregon
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Hi Chuck,
I am just through replacing the black water tank in my 1969 Caravel. The collector on mine was simply screwed on the valve with 4 screws. The valve assembly is threaded and was screwed to the tank. I didn't realize the collector was going to be difficult to replace (I'm new to Airstreams) and damaged (cut the 2" greywater female fitting off with a sawzall) mine taking it off. Inland RV has a replacement collector "on sale" for $89.00. That being said, some of the above suggestions look pretty appealing.
On the Out-of-doors mart website linked to above is a bayonet ring 89-8273 for $7.95 that connects to 3.5" outside diameter black plastic drain line. Maybe you could remove the flanges and make the bayonet ring attach to the outside diameter of the coupler without the lugs.
Anyway,my advise to myself is to pay more attention to what it will cost to fix something and what's available before I go too crazy with the power tools. good luck with the repair.
Scott
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Old 08-31-2010, 08:48 PM   #16
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yeah, I saw the $89 replacement collector, which appears to be $15 worth of standard fittings glued together, including that $8 bayonet ring. AND it would require another $50 valve, from what I can see.

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Maybe you could remove the flanges and make the bayonet ring attach to the outside diameter of the coupler without the lugs.
not quite sure what you mean, here. remove what flanges? The only way to remove the existing lugs would be to cut it off w/ a hack saw...and there doesn't appear to be enough pipe above that level to attach the bayonet ring to.
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Old 08-31-2010, 09:03 PM   #17
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Stevens Point , Wisconsin
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Chuck,
Vintage Airstream Home - Restortaion Resources has directions for making an adapter plate to convert the thetford valves to Valterra . The bolt patterns are not the same so a plate is needed. I replaced mine and it works great!
Tim
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Old 09-01-2010, 12:41 PM   #18
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I meant that if you remove the lugs, by cutting them off individually then filing / sanding them smooth, you are left with a pipe with outside dimensions just under 3.5". then you could possibly attach the bayonet ring to that.
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Old 09-01-2010, 12:49 PM   #19
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Yes, I saw the article on Vintageairstream; thanks for the tip!

That might work, too, although, it is about the brass valves/glassed in tank adapters; mine is plastic...but I don't know that it matters.

another thought: I was assuming that this tank adapter is glued (solvent welded) to the tank. (i.e. un-removable). I see that they have a version that threads on, as well. The glue-on type says "...for gluing to abs tanks"...threaded version says, "...for threading onto threaded fitting on polyethylene tanks".
I think this tank is polyethylene. don't know for sure. can't really tell from my pics if this is a thread-on, or glue-on. If its threaded, I could just un-screw it, and screw on an adapter that mates to valterra.
I checked the service manual, and it shows the adapter in the assembly, but it doesn't specify which type it is.
I wonder if one could e-mail the mothership, and ask?
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Old 09-01-2010, 01:40 PM   #20
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Quote:
Originally Posted by scottwtalley View Post
I meant that if you remove the lugs, by cutting them off individually then filing / sanding them smooth, you are left with a pipe with outside dimensions just under 3.5". then you could possibly attach the bayonet ring to that.
missed this before...but yeah, I was thinking that, too. the descriptions for the bayonet ring say "3" OD". It looks almost like the existing lugs are part of a glued-on ring....can't see in the pic, because the cap is covering it up. I'll have to go look again.
anyway, I wonder how difficult it would be to grind it down? would you use a hand-file, or a dremel, or what?
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Old 09-01-2010, 03:41 PM   #21
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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, 05:22 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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