McKillans Foam Cannon for Pressure Washer (Wide Mouth, 1/4" Quick Connector)
Priced as of May 23, 2026
4.5(1,912 ratings)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
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CarCareTruth's Analysis
Last reviewed May 26, 2026
TL;DR At 1,900–2,500 PSI the McKillans Wide Mouth cannon produces thick shaving-cream foam that multiple top Amazon reviewers describe as denser than competing mid-tier cannons (4.5 stars across 1,912 ratings) — though no community source documented a specific dwell-time figure in seconds. Brass valve body and stainless 1/4-inch quick-connect plug are confirmed in the exploded-view infographic; one top reviewer reports 1+ year of detailing use without failure. A scan of 13 text reviews and 10 video reviews surfaced one side-leak report and one first-use functional-failure report — each at one distinct reviewer, below the 3-distinct-reviewer threshold this site uses to flag a documented pattern.
What it is and how it performs
A 1/4-inch quick-connect pressure-washer foam cannon with a brass valve body, stainless quick-connect plug, top-mounted thickness control knob, rotating fan-pattern nozzle, and a 1 L translucent wide-mouth plastic bottle. The wide-mouth design makes refill easier than narrow-neck cannons. The listing rates the unit to 3,000 PSI and 2.5 GPM; community foam-thickness verdicts concentrate in the 1,900–2,500 PSI range, where top reviewers report dense output thicker than competing cannons in the same price band when paired with a foam-cannon-grade soap. Bottle resin code is not labeled on the listing or infographic.
Who should buy this — and who should skip it
Best for home detailers running a 1/4-inch quick-connect pressure washer at roughly 1,500–2,500 PSI / 1.5–2.5 GPM who want a wide-mouth bottle and brass valve internals. Note: listed as an Amazon Add-On Item — requires a qualifying cart total to purchase on its own. Skip if your pressure washer is M22-threaded and you don't already own a 1/4-inch quick-connect adapter, or if you need multi-season durability data the community has not yet documented past the one-year mark.
Frequently asked questions
What pressure washer do I need for the McKillans foam cannon?▾
The cannon uses a 1/4-inch quick-connect that fits most consumer gas and electric pressure washers (Ryobi, Sun Joe, most Karcher consumer units). For M22-threaded lances you will need a separate quick-connect adapter (not included). Listing is rated up to 3,000 PSI and 2.5 GPM; community foam-thickness reports concentrate in the 1,900–2,500 PSI range with a foam-cannon-grade soap.
Are there any leak or durability complaints?▾
Across 13 top text reviews and 10 video reviews in the Amazon listing, one video reviewer ('Leaks from the side / little help from customer support') reports a side leak and a customer-service complaint, and one video reviewer ('Stopped working on first use') reports a first-use functional failure. Two text reviewers explicitly state they experienced no leaks. Each failure mode appears at 1 distinct reviewer — below the 3-distinct-reviewer threshold this site uses to flag a documented pattern. The reports are recorded as watch-items rather than a confirmed defect pattern; multi-year ownership data is limited.
Is this an Amazon Add-On Item?▾
Yes. The Rainforest API metadata for this ASIN flags `is_add_on_item: true`, which means Amazon requires a qualifying cart total to purchase this product on its own. If you only need the foam cannon, expect to add it to a larger order or pair it with a soap purchase to clear the Add-On threshold.
What soap should I use with this cannon?▾
Use a car-wash soap formulated for foam cannons — high-foaming, surfactant-rich. Community evidence on this ASIN includes thick-foam reports paired with Chemical Guys HydroSuds. Other commonly paired soaps include Adam's Mega Foam, Chemical Guys Honeydew Snow Foam, and Bilt Hamber Auto-Foam. Start with 1–2 oz of soap concentrate per fill and tune with the top-mounted thickness knob.
How do I clean the cannon between sessions?▾
Run plain water through the unit for 30–60 seconds at the end of each session to clear residual soap from the jet orifice. The wide-mouth bottle unscrews by hand for rinsing; the stainless mesh filter at the pickup is accessible without tools. Letting the unit dry before storage prevents dried soap from clogging the jet.
From the manufacturer
Marketing copy from McKillans, via Amazon. Not editorial.
- •✅ Wide Mouth Design: The wide mouth bottle allows for easier dilution of soap. The wider bottle design providers a more stable base and prevents the foam cannon from falling over like other designs.
- •✅ Superior Cleaning：Thicker foam allows your car's paint to get a deep and delicate cleaning for a beautiful shine. Dirt and other surface contaminants are loosened and the foam adds extra surface lubrication which helps prevent swirl marks as a result of washing.
- •✅ Durability: The connectors are made out of high quality brass to withstand high pressure. The bottle is made of strong plastic and is also translucent; allowing you to see the remaining cleaner in the bottle.
- •✅ Adjustability: The amount of foam output can be adjusted using the control knob on the top of the foam cannon. Furthermore, the angle of output is also adjustable, allowing you to change the width of the foam stream. Adjust the thickness of foam to your liking.
- •✅ Why Us: Outputs amazing foam with both electric and gas powered pressure washers. Built with real copper and brass fitting, not cheap recycled metal like cheaper alternatives. Translucent bottle allows to you see the soap level, unlike others. More durable and leak resistant. High quality materials like the stainless steel quick connector.
- •✅ 1-Year Residential Warranty – We stand behind what we build, so you can continue trusting us to make your washes more enjoyable. (2025 Update)
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Manufacturer videos
Manufacturer images
Manufacturer specifications
- Brand
- McKillans
- Power Source
- gasoline-powered
- Color
- Brass
- Item Weight
- 0.62 Kilograms
- Specification Met
- CE, RoHS
- Tank Volume
- 1 Liters
- Maximum Flow Rate
- 2.5 Gallons Per Minute
- Global Trade Identification Number
- 00747465464793
- Maximum Pressure
- 3000 Pound per Square Inch
- UPC
- 747465464793
- Brand Name
- McKillans
- Model Number
- RH-G6RF-BQ84
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Serious Review
Great quality product. The nozzle is hefty with options to change the width of the spray and how much foam you want. Very easy to use and change settings on the fly. The bottle itself is fairly large for holding a good amount of soap. I have experienced no leaks using this. Overall it operates great and its durable.