I've already solved this problem. I'm posting this hoping to save the next guy googling for a solution a few bucks and a headache along the say.
I took my Jandy DEV60 DE filter apart for cleaning last weekend. During disassembly the o-ring between the manifold and the outlet tube didn't survive. The local pool store which is a Jandy dealer was no help. They could have one in 5 days for $93 (I think that was actually the tank o-ring he looked up but still)
Looking at the Jandy Site this is part number R0792000. The issue is they don't sell that part, they only sell R0358000 (about $20) which is a kit that contains all o-rings in the unit.
CAUTION: Punching R0792000 in amazon looks like it returns a valid search result. What it actually returns is R0357800 (Also about $20) which is the Tank O-ring. At first glance that picture may look like a pack of two outlet o-rings and it is easy to order the wrong part. (don't ask me how I know this).
On the second go-around I got the correct kit from Amazon. Included in the box was this handy little chart:


According to another site that sells o-rings that manifold to outlet o-ring is a AS568A-139. If the local hardware store doesn't have it, qty 50 is ~$10 on amazon.
I took my Jandy DEV60 DE filter apart for cleaning last weekend. During disassembly the o-ring between the manifold and the outlet tube didn't survive. The local pool store which is a Jandy dealer was no help. They could have one in 5 days for $93 (I think that was actually the tank o-ring he looked up but still)
Looking at the Jandy Site this is part number R0792000. The issue is they don't sell that part, they only sell R0358000 (about $20) which is a kit that contains all o-rings in the unit.
CAUTION: Punching R0792000 in amazon looks like it returns a valid search result. What it actually returns is R0357800 (Also about $20) which is the Tank O-ring. At first glance that picture may look like a pack of two outlet o-rings and it is easy to order the wrong part. (don't ask me how I know this).
On the second go-around I got the correct kit from Amazon. Included in the box was this handy little chart:


According to another site that sells o-rings that manifold to outlet o-ring is a AS568A-139. If the local hardware store doesn't have it, qty 50 is ~$10 on amazon.