This Acetal bullet is specially designed for to make the task of putting on the o-ring on the Scubapro DIN retainer easy! Any technician having undertaken this job without the tool will know how frustrating this task can be.

It is used by capping the bullet on the retaining knob and simply slide the o-ring down into its groove. The tool eliminates the need to stretch the o-ring over the threads of the part, preventing potential damage.

Regulator parts are not included.