SIMPSON foam cannon for pressure washer 1 L — 1/4" quick-connect, adjustable foam & twist nozzle

The SIMPSON Pressure Washer Foam Cannon 80271 is a 1-liter, 1/4" quick-connect foam lance that produces clingy, thick foam for vehicles, siding, boats and more when used with 1600–4000 PSI cold-water washers.

This foam cannon is designed to turn diluted detergent into a high-foaming spray that sticks to vertical and angled surfaces long enough to loosen dirt and grime. Built with heavy-duty brass fittings and a standard 1/4" quick-connect plug, it pairs with most gas or electric pressure washers in the specified pressure range. The top-adjustment knob controls foam thickness while the twist nozzle varies the spray pattern, so you can go from wide coverage to a focused fan for spot work.

How does the foam cannon improve washing results?

By atomizing soap into a dense foam, the cannon increases the contact time between detergent and surface, helping soils soften before rinsing. That means less aggressive scrubbing and a lower risk of surface marring when compared with direct high-pressure-only washing.

• Produces thick foam that clings to surfaces for better cleaning action.
• Adjustable foam knob for light to heavy sudsing depending on soil level.
• Twist nozzle changes spray width to suit cars, siding, or heavy equipment.
• Reduces manual scrubbing when used with appropriate cleaner.

Will it work with my pressure washer?

The SIMPSON 80271 was made for cold-water electric and gas pressure washers rated between 1,600 PSI and 4,000 PSI. For reliable foam production, the washer should produce at least 1,600 PSI; anything above that and up to 4,000 PSI is supported.

• Standard 1/4" quick-connect plug fits most wand fittings labeled QC/quick connect.
• Works with washers that meet the 1600–4000 PSI operating window.
• Best paired with pressure washers that provide steady flow to maintain foam density.

How do I use and maintain the foam cannon?

Using the unit is straightforward: dilute a recommended detergent into the 1-liter bottle, connect the 1/4" QC plug to your pressure washer wand, then adjust the nozzle and foam knob until you get the desired spray and suds. After each use, flush the cannon with clean water for at least 30 seconds to prevent chemical buildup and protect fittings.

• Follow soap manufacturer dilution guidelines to avoid residue or damage.
• Attach the QC plug to the wand, then twist nozzle for spray shape adjustment.
• Turn the top knob to increase or decrease foam thickness.
• Rinse thoroughly after use to protect seals and brass fittings.

What are the build and capacity details?

The foam cannon features heavy-duty brass connections and a 1-liter (33 oz) detergent reservoir, giving a balance of durability and run time for most consumer cleaning tasks. It’s intended for cold-water applications only and sized for convenient handling during vehicle, deck, and exterior washes.

• Durable brass fittings with standard 1/4" quick-connect plug.
• 1 liter (33 oz) translucent container for easy fill and level checks.
• Designed specifically for cold-water pressure washers.

Who is this for? The SIMPSON 80271 Foam Cannon fits DIYers and professionals who want faster, gentler cleaning on cars, trucks, RVs, boats, house siding and outdoor equipment. Choose this cannon if you have a compatible 1600–4000 PSI cold-water pressure washer, prefer adjustable foam control, and value brass hardware for durability. If you routinely use high-strength chemicals, follow manufacturer detergent instructions and flush the cannon after each session to extend its service life.