[richardt]

Confused by the various keg types like I am? 
Cornelius, Firestone, Challenger, ball-lock, pin-lock, racetrack, italian, poppets, etc.
Is there an online picture atlas of the various corny keg types and parts for reference purposes?
Is there some code or model number on the part or keg that I should be looking for?
I keep all the components of each keg together when I break them down for cleaning, so I haven't had any issues there.
I do have one keg that seems to have a pressure-relief valve that won't hold pressure well and likely needs replacement.
I can't tell where to look on the PRV to determine which type it is.

Thanks in advance.

[Joe Sr.]

The kegs should be stamped on the side with the model/manufacture of the keg.

Sometimes these markings can be covered with stickers from the previous user.

If the outside of your keg is clean, though, you should find info that says "challenger V" or "corneluis" or "firestone" or whatever.

You might also be able to match the poppets, posts and PRV against the photos of one of the on-line vendors (NB has pretty clear images of the different parts).  Or take them in to the LHBS.  They ought to be able to tell you what you need.

I've got two different style PRVs on my kegs.  Most have a ring that you can pull, two of them (I believe they are Challenger kegs) have a little plastic lever-type-thing that opens the valve.

[thomasbarnes]

Google image search?

[tom]

http://www.northernbrewer.com/brewing/kegging/soda-kegs-fittings
There are new "universal" pressure relief valves.  It used to be that the black ones were for the lids with 2 holes on the side of where the PRV goes, and the grey for 6 holes.

[pyrite]

http://hbd.org/carboy/ballkegclean.htm

I know there's a better one out there, I've seen it, but I just can't find it.