Dose it have the pressure relieve system?
ROBERT U Yes, the standard Poseidon regulator hose has the pressure relief in the collar by the second stage. If you have a newer regulator with the pressure relief in the first stage body, you can use a normal regulator hose with a solid collar adapter.
JOHN M no, this hose does not, how ever you can buy a relief valve that screws in
to your first stage for very little money $14.95 from leisure Pro (SOPV )
frankly it's the best way to go Jack Murphy,