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Old 05-06-2017, 11:52 PM   #1
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1977 Argosy Minuet 6.0 Metre
Cody , Wyoming
Join Date: May 2017
Posts: 3
Sewage drain cap

Hello. Last year, the cap that goes over the exit drain under my 1977 Argosy Minuet fell off. It was in bad shape, anyway, so I didn't worry much. This year, I wanted to replace it.

I ordered one from Amazon - with the garden hose fitting attached - and promptly discovered that it is too small. It's 3 inch, but it looks like it would need to be 3 1/4 to fit my trailer.

I've searched amazon, vintage trailer sites, Airstream sites, ebay, etc. and can't find what I need anywhere. I can't even find an adapter so I can use 3" fittings.

Does anybody out there have any solutions for this?
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Old 05-06-2017, 11:56 PM   #2
Rivet Master
1995 25' Excella
xxxxx , xxxxxx
Join Date: Apr 2015
Posts: 2,053
Did your order a Valterra cap, but needed a Thetford?
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Old 05-07-2017, 12:04 AM   #3
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1977 Argosy Minuet 6.0 Metre
Cody , Wyoming
Join Date: May 2017
Posts: 3
Maybe so. This is the one I ordered:

It's apparently a Duraflex, but it's not marked.
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Old 05-07-2017, 03:25 AM   #4
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Yes, two sizes available..
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Old 05-07-2017, 04:53 AM   #5
2 Rivet Member
1977 25' Tradewind
Florence , South Carolina
Join Date: Mar 2013
Posts: 47
I have a 1977 Tradewind so yours is probably similar to mine. Here's what I needed:

An adaptor/transition from the Thetford size to the Valterra size. Then you can use the cap that you already have. Here's the link:

The sewer connection on the 77's are sized for Thetford caps and hoses but the "standard" size is Valterra. Using this adaptor will allow you to use standard accessories with your trailer.

Since learning this (I had to learn this the hard way while on the road) I just keep a spare adaptor in the camper. Will probably never need it, but for an extra $10 it is worth it for my peace of mind.

I hope this helps! Happy Streaming!
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Old 05-07-2017, 07:04 AM   #6
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Chelsea , Maine
Join Date: Aug 2016
Posts: 327
I would get the adapter and glue it on.
2017 FC 27FB
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Old 05-07-2017, 10:56 AM   #7
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1977 Argosy Minuet 6.0 Metre
Cody , Wyoming
Join Date: May 2017
Posts: 3
Placed the order

Thank you all so very much!

I thought it was a problem that might not be solvable. I appreciate your quick response and Amazon should have the adapter to me in plenty of time.

Take care and have a wonderful Summer.
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