This will adapt a standard high pressure port size to an old school 3/8 fitting. Just a note, you can not use this fitting to change a high pressure port to a low pressure size. If you use this adapter and put a low pressure hose on it, the hose will rupture and you can get injured. The only reason that I can see to do this is to buy cheap high pressure hoses from me and this adapter instead of a standard high pressure hose.
It is your responsibility to make sure you know what you are doing. Aqua Sport takes no liability for the incorrect use of this adapter.
High pressure is 140 psi to 3500 psi
Low pressure is 140 psi and lower.
