Chemical Guys Big Mouth Max Foam Cannon for Pressure Washers, 34 oz — Wide-Mouth Bottle, Adjustable Nozzle

The Chemical Guys Big Mouth Max Foam Cannon is a 34 oz pressure-washer attachment that produces thick, clingy foam to loosen dirt and speed up safe vehicle and exterior cleaning.

Built for enthusiasts and pros, this foam cannon turns a standard pressure washer into a high-foaming car-wash system. Its oversized wide-mouth bottle makes filling fast and drip-free, while the adjustable nozzle and air-injection design create a rich lather that adheres to surfaces so cleaners can work longer and rinse easier. Constructed with reinforced components and stainless-steel fittings, the Big Mouth Max is designed to withstand frequent use on cars, trucks, boats, and outdoor surfaces.

How does the Big Mouth Max create thicker foam?

Foam thickness comes from combining a precise nozzle with an air-injection mechanism that mixes more air into the detergent stream. That produces a dense, shaving cream–like foam that clings to paint and breaks down grime without aggressive scrubbing.

• Air-injection technology increases foam volume and dwell time
• Adjustable nozzle changes spray pattern from wide fan to narrow stream
• Compatible with a variety of Chemical Guys shampoos for different foam densities
• 34 oz tank supplies enough solution for several vehicles or large jobs

Will this fit my pressure washer and soaps?

The Big Mouth Max is designed to work with most standard pressure washers when used with the proper adapter or quick-connect (check your washer’s fitting). It accepts many Chemical Guys wash formulas—maintenance shampoos, concentrated cleaners, and advanced soap blends—so you can match foam performance to the job.

• Standard inlet fittings for common pressure washer models (verify compatibility)
• Works with both high- and low-sudsing Chemical Guys shampoos
• Wide-mouth bottle accepts thicker, gel-style cleaners without clogging
• Adjustable dilution and spray pattern to fine-tune output

How does the wide-mouth design improve the wash process?

The oversized opening simplifies mixing and pouring, eliminating spills and wasted product that commonly occur with narrow-neck bottles. A larger capacity also reduces refill interruptions when washing multiple vehicles or larger equipment like RVs and boats.

• Wide fill opening allows direct pouring from product bottles without funnels
• 34 oz capacity covers several standard car washes per fill
• Clear markings and robust construction resist cracking and leaks
• Easy-to-clean bottle interior for switching between detergents

Is the Big Mouth Max durable enough for repeated professional use?

Yes—the cannon uses heavy-duty plastics, reinforced seals, and stainless-steel fittings to stand up to regular use and pressure-washer conditions. That robustness helps maintain consistent foam delivery and reduces downtime from component wear.

• Stainless-steel connections resist corrosion from water and cleaners
• Durable seals prevent leaks and maintain pressure performance
• Reinforced bottle material resists impact and UV exposure
• Serviceable components simplify maintenance and part replacement

Who this is for: The Chemical Guys Big Mouth Max Foam Cannon suits DIY car detailers, mobile detail businesses, and homeowners who want faster, gentler washing for vehicles and exterior surfaces. It’s especially useful for anyone cleaning multiple vehicles, large transport, or boats where refills and rework time matter. If you use a pressure washer and want clinging foam, fewer touch washes, and a more efficient rinse, this foam cannon is a practical upgrade to your wash kit.