EASY TO INSTALL-Fill some soap into the bottle with warm water to get thick foam; Then connect 1/4" quick connection plug to pressure washer gun or wand. Specification for pressure washer: 1000 PSI to 3600 PSI. Finally, adjust the knob to desired foam level and then the snow foam lance will disperse thick foam. EXCELLENT QUALITY-The bottle body is made of strong PA, durable and difficult to damage, and the adapter is made of engineering plastics, which can be used for a long time. Foam spray gun with foam adjustment knob and spray angle knob. STRONG CLEANING POWER- The dense and rich foam has a strong cleaning power and can easily melt stains on rods and paint, thus reducing swirl marks and scratches