This Acetal bullet is specially designed for to make the task of putting on the o-ring on the Apeks HP balance plug retainer easy (part # AP5202 or AP1486).

It is used by capping the bullet onto the plug 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 to the o-ring.

Regulator parts are not included.