This high pressure extension hose is manufactured with Type 30 CO2 Male Thread on one and and a Type 30 CO2 Female thread on the other end.

This useful device will enable you to place your regulator remotely from your gas cylinder.  The reason to do this is so that you can place your gas cylinder on the ground then have your CO2 Regulator mounted to your wall or gas board where it's convenient and at eye level.

This hose is particularly useful if you are making up your own CO2 gas boards.