1.1mm orifice: for under 1595 PSI (110Bar) pressure washer 1.25mm orifice: for 1595 PSI (110Bar) ~ 2176 PSI (150Bar) pressure washer 1.35mm orifice: for 2176 PSI (150Bar) ~ 4061 PSI (280Bar) pressure washer 1.65mm orifice: for 4061 PSI (280Bar) ~ 4931 PSI (340Bar) pressure washer MJJC Foam Cannon Orifice is a Nozzle Screw Jet for MJJC Foam Cannon S, Pro.(Works with both V2.0 and V3.0) Before buying this item, make sure your foam lance is purchased from or branded as MJJC, as it might not work correctly on other branded foam lances. MJJC Foam Cannon Orifice is a Nozzle Screw Jet for MJJC Foam Cannon S, Pro.(Works with both V2.0 and V3.0) Before buying this item, make sure your foam lance is purchased from or branded as MJJC, as it might not work correctly on other branded foam lances.