If you intend to use a SCBA tank, or any other tank with a CGA347 valve for the Input air for our High Pressure Air boosters, then this is what you need.  The hose is 6 feet long, and it is rated for 6000psi.  On one end, there is a SCBA tank adapter, and on the other end is a 1/8" NPT to 1/4" NPT female coupler.  This unit will thread right on the booster's input check valve.