I recently bought a couple of used ball lock kegs, but they came with pin lock style lids, with the static PRV. Is it possible to replace those with a pull-ring type PRV? Thanks!
I don't think fitting a manual PRV to a pin lock lid is anything trivial.
Considering the PRV price is only a couple/few bucks cheaper than a new lid with PRV and O-ring I'd say it's a no brainer to just buy new lids.
I've found them priced as little as $16 delivered on Amazon...