Field King Max 190348 Backpack Sprayer for Professionals Applying Herbicides Internal No Leak Pump design is safer to use - chemicals will not drip down your back. Durable, 21 inch stainless steel wand with the highest quality Viton seals for chemical resistance. Premium, lockable shut off with brass components and an in-line filter. Easy access pump, change seals in just minutes with no tools. 4 nozzles included: brass adjustable, 2 flat fans, and foaming nozzle. Also accepts TeeJet nozzles.