the Apex Customs Professional grade pump up pressure sprayer is the perfect for a rinse-less washes, or even applying any of your favourite detailing chemicals The Sprayer features adjustable foaming capability and is designed to produce a consistent and lush foam from either a concentrated or diluted soap mixture for cleaning purposes. This is especially useful for applications where there is no access to a continuous supply of water or a hose. If using chemicals with foaming agents in them, you can expect greater consistency and coverage, whilst using less of your chosen chemical. How do I adjust the foam output on an apex sprayer? Unscrew the sprayer nozzle Remove the felt disk Install the required plastic spacer (longer spacer = less dense foam) Reinstall the felt disk Reinstall the sprayer nozzle, and check for leaks Check out the product photos for a picture breakdown of the procress.