8. The high-pressure fitting consists of two parts—an inner and outer. The hose needs to be gradually screwed into the outer fitting in counterclockwise motion (it’s reverse threaded inside the fitting). When the hose bottoms out on the fitting, it’s time to lube the inner fitting and screw that in (see next photo for finished hose end). The two fittings act as a wedge or a clamp to seal the hose against pressure that will reach 1,500 psi.