Air-aspirating foam-making attachment for all 1.5" & 2.5" (38mm & 64mm) ThunderFog nozzles. Flow range of 30-250 gpm (110-1100 l/min) matches that of corresponding 1.5" & 2.5" (38mm & 64mm) ThunderFog nozzle (needed for operation). The MX-FOAMJET is constructed of durable UV stabilized polyethylene and aluminum. Diameter 8.6" (21.8cm).