Used Regulator?

I am looking at purchasing a used CO2 regulator off CL. What things should I be concerned about?  How can I test it to see if it works properly? Any visual problems I should look for? Taprite series 3740

It is dirt cheap. I want the extra body so I can have a double system in my kegerator.

Bring a tank and hook it up. Adjust the pressure and see if it seems to behave correctly. Not sure what else you can do.

+1
You can also open it up and see if it’s clean inside or if it appears to have corroded or sucked up beer in its past.

Fail…

I bought the regulator for $20, all is well except I forgot to look at the low pressure gauge. 0-160 doesn’t do much good considering the first line on the dial was 10 in 5 psi intervals.  This is an $8.00 fix along with the $4 stem…$32 for a regulator doesn’t seem like a bad deal.

Yeah that’s still a good deal.

Remember the days when a new regulator cost $35 new? Kegs were $20 and hops were $5/oz. Well at least hops are cheap these days.