Jacto HD-400 4-Gallon Heavy-Duty Backpack Sprayer — White, Viton Seal & 65 PSI Durable

The Jacto HD-400 is a heavy-duty 4‑gallon backpack sprayer built for landscapers, farmers and homeowners who need a leak-resistant, long‑lasting sprayer that handles caustic chemicals.

Built around a UV-resistant polypropylene tank and a poly piston pump mounted inside the reservoir, the HD-400 prioritizes durability and safety. Independently tested for more than 1,500 continuous hours of operation, it reaches useful pressure quickly (six pumps to about 45 psi) and offers a maximum of 65 psi, making it suitable for a range of liquid applications. The model ships with a Viton piston cup for compatibility with harsher chemistries and includes comfort and convenience features that help reduce fatigue during extended use.

How fast does the HD-400 build and hold working pressure?

The HD-400 is engineered for efficient pumping so you spend less time pressurizing and more time spraying. The internal poly piston pump reaches working pressure in only six pumps and can achieve up to 65 psi when needed.

• Six pumps to reach approximately 45 psi for routine spray tasks.
• Maximum rated pressure of 65 psi for higher-demand jobs.
• Internal pump mounting reduces external leak points for consistent pressure retention.

Is this sprayer safe to use with corrosive or caustic products?

Yes — the HD-400 includes a Viton piston cup, chosen specifically for resistance to many aggressive chemicals. Combined with a polypropylene tank and metal bushings where durability matters, the unit stands up better to corrosive solutions than general-purpose sprayers.

• Viton piston cup improves chemical compatibility for tougher formulations.
• Polypropylene UV-resistant tank resists degradation from solvents and sun exposure.
• Stainless steel wand and heavy-duty metal trigger resist corrosion at key contact points.

What comfort and usability features reduce fatigue during long shifts?

Ergonomics are a focus: padded, quick-adjust shoulder straps and a shaped carry handle help distribute weight while the lockable trigger reduces hand strain during repetitive spraying. The convertible pump lever and two axle positions let left- or right-handed operators set the unit up for easier, more efficient use.

• Adjustable padded shoulder straps for prolonged comfort.
• Handle and lance locks for secure storage and transport.
• Convertible pump lever and two axle positions for left/right preference.

What components help with maintenance and field repairs?

The HD-400 is designed so routine maintenance and simple field repairs are straightforward. Metal bushings, a removable pump lever that doubles as a repair tool, and a large fill opening make servicing and refilling quicker and less messy.

• Removable pump lever doubles as a field repair tool.
• Large fill opening and clear volume markings in gallons and liters for fast refills and accurate mixing.
• Durable composite base and metal bushings for long life under heavy use.

Who is this for? The Jacto HD-400 is aimed at professionals — landscapers, growers, pest control technicians — and serious homeowners who need a reliable, chemical-compatible backpack sprayer. It suits anyone who requires a rugged, easy-to-maintain unit with ergonomic carrying features and quick pump-up performance for daily or repeated tasks. Backed by a three-year commercial warranty, it’s a practical choice when durability and chemical resistance matter.