This little delrin plug is used to fix the interstage pressure on an Apeks DS4 first stage.

It will stop the regulator from compensating the I.P with depth and keep it to where you set it.

This is for use with KISS type O2 injection using constant mass flow


DO NOT BUY THIS UNLESS YOU KNOW WHAT IT IS AND HOW TO USE IT....USING THIS ON OPEN CIRCUIT EQUIPMENT COULD BE VERY DANGEROUS