The Scotty forestry foam pump and backpack is a single action pump, with a foam educting attachment and air aspirating nozzle. The 4000F-BP eliminates the need to batch mix when Class A foam is required. Each time the pump is charged, 1% of foam concentrate is educted into the pump chamber. The 4003 air aspirating nozzle generates foam when the pump is discharged.

The pump has a brass pump chamber protected by an engineering grade polymer sleeve. No tools are required to disassemble the unit, it can be completely disassembled by hand for in-the-field maintenance.

The Back Pack has a capacity of 5 US gallons (19 Lts). Manufactured from a strong polyester based fabric, protected by a thermoplastic polymer. It has a 4" filling port with a removable debris screen, 2" wide shoulder straps and 3" wide shoulder pads.