Old stock never used relief valve with manual pull release on 1/4" NPT male with 1/4" NPT female exit
Factory set to 10 psi but can be set to anything in between 10 to 225 PSI depending on how you tighten the top adjustment head/nut
Swagelok RL3 series
Unit has never seen service and it is not contaminated with anything. Unit has never been screwed into anything.
It's a new unit outside it's bag
The unit has the red knob on top for manual pull release. It can be used for air compressor applications or more corrosive environments.
Units like this take forever and a day to have Swagelok make and they cost around 300 bucks.