The Shampoo Gun turns your favorite car shampoo into super thick, long-lasting foam. This air-driven foam gun works with your air compressor to produce frothy, rich foam that has amazing cling. The suds are so light and fluffy, they cling to vertical surfaces without running off. The Shampoo Gun can be used for interior or exterior detailing. Use it with a carpet cleaner or with auto shampoo to spray a snow storm of foam! For optimal performance, the Shampoo Gun works best with an air compressor that produces 5 CFM or more at 90 psi.