I use pin lock kegs, and until now all of them have been Firestone/Spartanburg. I recently received a Cornelius brand three-gallon pin lock keg. The post threads on this keg are different from all the others, and so are the poppets. The ones that are installed look like this.
The problem I have is that if I only place a single o-ring on each dip tube, the posts leak from underneath. The posts just screw right on with no resistance, and it doesn't create a seal with the dip tube o-ring. I have to have two o-rings on each dip tube to create the seal. (I noticed there were two o-rings when I disassembled it to clean it.)
Is this normal? It really seems like the poppet is just too short. I've found this poppet, which is 1/8" inch taller than the ones that it came with. It says it is for a Cornelius Type 'R', but I don't know if that's what I have.