NPT (National Pipe Taper) fittings have working pressures up to 15000 psi. However, working pressures may be decreased depending upon thread size.
SPIR STAR® Hose Adapter, Adapter Fitting, 1/2 in Connection Size 1, MNPT Connection Type 1, 3/8 in Connection Size 2, MNPT Connection Type 2, MNPT|MNPT Connection, 15000 psi Maximum Operating Pressure
|Connection Size 1||:||1/2 in|
|Connection Size 2||:||3/8 in|
|Connection Type 1||:||MNPT|
|Connection Type 2||:||MNPT|
|Maximum Operating Pressure||:||15000 psi|