AMSOIL Foam Cannon
The AMSOIL Foam Cannon is a pressure-washer attachment that mixes high-foam car shampoo with water and air to lay down a thick, clinging blanket of suds across painted body panels, glass, plastic trim, and wheels. Product code G3911-EA pairs a 35-oz reservoir, a 1.25 mm orifice, and a standard 1/4 inch quick-connect fitting to mate with most consumer and gas pressure washers used for vehicle detailing. The cannon is sized for owners who want a touch-light pre-wash that softens road film and lifts dirt before any contact wash step.
Foam-bath wash technique with thick clinging suds
Pre-foaming a vehicle softens road film, bug residue, brake dust, and salt, which reduces the amount of grit dragged across paint during a contact wash. The AMSOIL Foam Cannon delivers a dense, slow-running foam blanket from 2 oz of AMSOIL High-Foam Car Shampoo mixed with fresh or deionized water. The foam clings long enough to break down contaminants and float them off clear coat before scrub and rinse, which lowers the risk of wash-induced swirl marks and micro-marring on dark paint.
Pressure washer compatibility, psi and gpm
The cannon is rated for pressure washers operating between 870 and 3190 psi, and a flow range of 1.3 to 5.3 gpm. That window covers most consumer electric pressure washers at the low end and the majority of gas pressure washers used for vehicle detailing on the high end. Maximum incoming water temperature is 140 degrees F. Confirm the pressure washer rating plate falls inside this pressure, flow, and temperature window before attaching the cannon.
Standard 1/4 inch quick-connect fitting
A 1/4 inch quick-connect coupler on the spray nozzle mates with the standard quick-connect socket found on most consumer and gas pressure washer wands. No adapters or thread tape are required for outlets that already follow the 1/4 inch quick-connect standard. Pressure washers with a non-standard outlet need the matching male 1/4 inch quick-connect plug installed at the wand before the cannon will seat.
Adjustable spray pattern, dilution, and orientation
A control valve at the top of the nozzle adjusts the soap-to-water dilution ratio, allowing a wetter mix for a fast pre-soak or a thicker mix for a longer dwell. The gray end of the nozzle twists to widen or narrow the spray pattern, focusing tightly on lower body panels and rocker areas, or fanning wide for the roof, hood, and sides. The black section of the nozzle rotates 360 degrees to change spray orientation between vertical and horizontal without moving the unit, which helps reach wheel wells, the underside of side mirrors, and tight panel gaps.
Wide-mouth reservoir and stable wide base
The 35-oz reservoir uses a wide mouth to make filling and dilution measurement easier, and a wide base that keeps the cannon upright when set down between sweeps. The 1.25 mm orifice is sized to produce a thick foam profile when paired with a high-foam shampoo concentrate, rather than a thin, fast-rinsing spray. Premium nozzle and reservoir components are intended to hold up to repeated wash cycles in driveway and detail-bay use.
Recommended applications and service intervals
The AMSOIL Foam Cannon pairs with a compatible pressure washer for car, truck, motorcycle, ATV, UTV, side-by-side, and recreational trailer wash work. Match it with AMSOIL High-Foam Car Shampoo for the foam profile the orifice and reservoir are sized to produce, and follow the AMSOIL Wash Mitt step in the published wash directions for best results before the final rinse.
- Run the pressure washer between 870 and 3190 psi and 1.3 to 5.3 gpm, with incoming water no warmer than 140 degrees F.
- For a standard wash mix, dose 2 oz of AMSOIL High-Foam Car Shampoo with fresh or deionized water in the 35-oz reservoir.
- Allow the foam to dwell for a few minutes before contact washing, but do not let the foam dry on paint, glass, or plastic trim.
- After every wash session, rinse the cannon with clean water, remove the reservoir, and flush all soap residue from the nozzle assembly and reservoir threads.
Avoid soaps, detergents, and chemicals that contain abrasive particles or grit, since suspended solids can score the orifice, valve seats, and reservoir threads. The Foam Cannon is a hardware accessory and is not packaged with a Product Data Bulletin or Safety Data Sheet. Coverage and exchange terms are governed by the AMSOIL Return Policy in effect at the time of purchase.
Order the AMSOIL Foam Cannon
The AMSOIL Foam Cannon ships under product code G3911-EA as a single each. For vehicle-specific shampoo, wash mitt, and detailing pairings, start with the AMSOIL vehicle lookup guide or browse the full AMSOIL product catalog, then place an order through the AMSOIL Foam Cannon product page.
Frequently asked questions
How does a foam cannon work?
A foam cannon uses pressurized water from a pressure washer to draw concentrated car shampoo from an onboard reservoir, mix it with air, and force the mixture through a calibrated orifice. The result is a thick, slow-collapsing foam that clings to vertical paint surfaces long enough to soften and float contaminants away from the clear coat before contact washing.
How much soap goes in the AMSOIL Foam Cannon?
Mix 2 oz of AMSOIL High-Foam Car Shampoo with fresh or deionized water in the 35-oz reservoir for a standard wash. Adjust the dilution valve at the top of the nozzle to make the foam wetter for a fast pre-soak or thicker for a longer dwell.
What pressure washer does the AMSOIL Foam Cannon need?
The cannon is rated for pressure washers running between 870 and 3190 psi with a flow rate of 1.3 to 5.3 gpm. Most consumer electric pressure washers and the majority of gas pressure washers used for vehicle detailing fall inside that window. Maximum incoming water temperature is 140 degrees F.
How does the cannon connect to a pressure washer?
The spray nozzle uses a standard 1/4 inch quick-connect fitting. Pressure washers that already follow the 1/4 inch quick-connect standard accept the cannon directly. Non-standard outlets need the matching male 1/4 inch quick-connect plug installed at the wand first.
Can any car soap be used in the cannon?
The cannon is engineered around AMSOIL High-Foam Car Shampoo concentrate, which produces the thick foam profile the 1.25 mm orifice and 35-oz reservoir are sized for. Soaps, detergents, or chemicals that contain abrasive particles must not be used because suspended solids can damage the nozzle and valve components.
How is the AMSOIL Foam Cannon cleaned after use?
After every wash session, rinse the cannon with clean water. For best results, remove the reservoir and flush soap residue out of the nozzle assembly and reservoir threads. This prevents dried shampoo from clogging the orifice or stiffening the dilution valve.
Are foam cannons worth using on a daily driver?
A pressure-washer foam cannon adds a touch-light pre-soak step that softens road film and lifts grit off paint before any wash mitt touches the surface. For daily drivers parked outdoors, that pre-soak step lowers the risk of swirl marks and micro-marring during routine maintenance washes, and shortens the time spent on the contact wash itself.
