Charlottesville Area Masters of Real Ale

Does anyone know what the size of the standard cornie keg "O" rings are?  I think I need to replace all of mine, except the large center port one, as I am still getting CO2 leaks, but it is definately in the kegs somewhere.  I know that the smaller O rings are standard size, so they can be purchased at Lowes, but I don't know what the actual size is.  Thanks for your help.

I did a search for this topic on Google yesterday during lunch.  I found the following information on the BrewBoard.

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Q: I just got a bunch of used kegs and I want to replace the o-rings. Do you know where I can get them in bulk?
A: Sure. You can get corny keg o-rings from McMaster-Carr. Here's what you'll need (prices as of May 1, 2005):

(1) Dip Tube O-Rings
5/16" ID x 1/2"OD x 3/32" width
9452K172 BunaN #109
Pkg 100/$2.24

(2) Post O-Rings
7/16" ID x 5/8" OD x 3/32" width
9452K23 BunaN #111
Pkg 100/$2.77

(3) Lid O-Rings
3 1/2" ID x 4" OD x 1/4" width
9452K218 BunaN #417
Pkg 10/$12.50

Q: What about the so-called quad-rings (a.k.a., h-rings, double-seal rings) for the dip tube seals?
A: Dip tube seals: 90025K368 - Double Seal Buna-N O-Ring As568A Dash #109, Pkg 100/$4.72
Post O-Rings (A70 durometer): 90025K224 Dash #111, Pkg 100/$11.40
Post O-Rings (A50 durometer): 2418T136 Dash #111, Pkg 100/$9.00

Q: Those are more expensive than the regular o-rings. What's the advantage?
A: They seal without excessive force. Tightening the posts too much can result in galling the threads.

Q: I've also heard that silicone o-rings work better than Buna-N on the posts. Is there a part number for these?
A: 9396K24 - Silicone O-Ring As568A Dash#111
Pkg 100/$13.53

I don't know if the o-rings are standard, but I bet they are.  The ports all look the same.

I would guess that the rings on the ports depend on the style (coke vs pepsi), since that is standard.

I don't know about the dip tubes, having never disassembled a pepsi (ball lock) keg.

I do know that the popet arrangements come in different flavors.  The guys at the Flying Barrel in Frederick MD helped me retool my kegs, and explained that it would have been impossible to replace the popets without seeing them.  After replacing all the o-rings and both spring loaded popets, my kegs stopped leaking.  mine are pin lock.

Yeah, I was able to get the post O rings at Lowes, though I had to go back a second time because they had sold out of the right size.  Everything seems gas-tight now and I have not had a leak since.