This foam gun works well with most concentrated Truckwash.

P1P Foam Gun also benefits from a leak proof hoselock male connection that is a perfect fit for the general garden female hoselock connectors, a significant improvement over the original Foamaster Gun.
Features:

Exceptional chemical resistance to acidic or caustic cleaners
Accurately mixes and sprays foaming chemicals
Foam generating wand creates a thick, clinging foam
Fan spray deflector included for disinfectants, etc.
Durable polymer mixing head with stainless steel screws
Quick-set dial selects mixing ratio