HFS R BACKPACK FUMIGATION SPRAYER, MANUAL OPERATE (4.2 Gallon) The HFS 4 Gallon Backpack sprayer makes gardening, pest control, and other spray-on application a breeze. The simple hand-pump system is easy to use while wearing the sprayer and provides a strong full spray. The wand features a interchangeable spray nozzle, and a lock-on option for continuous spraying. The sprayer also features a integrated filter and a 4ft hose to the wand. Included with the sprayer are 4 different spray nozzles, extra o-rings and parts, and a user manual.