Patent ID: 7744018

Claim:
A spraying apparatus comprising: a power operated pressure washer unit adapted for generating a high pressure liquid discharge at a liquid outlet thereof, an outlet fitting in fluid communication with said pressure washer liquid outlet, a spray gun having a high pressure liquid supply hose with a connector fitting at an upstream end thereof, said connector fitting having an axial stem having a central liquid passageway positionable into said outlet fitting for communicating liquid through said connector fitting between said outlet fitting and said high pressure liquid supply hose, at least two axially-spaced annular sealing members disposed about said connector fitting axial stem, said connector fitting having a retaining ring threadably engageable with said outlet fitting for securing said axial stem in said outlet fitting with at least one of said annular sealing members in sealing engagement with said outlet fitting, said retaining ring being rotatable in a first direction for screwing said connector fitting onto said outlet fitting, and said retaining ring being rotatable in an opposite direction for unscrewing the retaining ring from the outlet fitting to permit removal of the connector fitting from the outlet fitting, and said connector fitting having a transverse passageway communicating from said central passageway outwardly through said axial stem at a location between at least two of said axially spaced annular sealing members such that upon unscrewing of said retaining ring from said outlet fitting a high pressure buildup within the high pressure liquid supply hose and outlet fitting is permitted to gradually dissipate and vent through the transverse passageway while said retaining ring retains said connector fitting on said outlet fitting.