Heavy duty brass core is much thicker and heavier, nozzle and plastic connector are tighter, don’t shake easily for durable use. Bigger foam core make foam is more dense and thick.

Filling up the reservoir bottle with soap, click into your existing pressure washer lance or trigger, adjust the knob for your desired foam level, and spray! Turning the top knob right / closed to get the thickest mixture, adjust the nozzle to get a proper spray pattern, and let it loose.