Foam lance Karcher (MPN 6.394-668.0) — professional foam sprayer for pressure washers

Karcher foam lance (MPN 6.394-668.0) is a professional attachment for compatible pressure washers that produces thick cleaning foam to support degreasing and pre-washing. Designed to connect to pressure washer wands, the foam lance dispenses adjustable foam concentration to improve detergent coverage on vehicles, building exteriors, industrial equipment and other washable surfaces. Using the foam lance helps reduce rinsing time and promotes more efficient cleaning by keeping cleaning agents in contact with surfaces longer than a simple spray.

Advantages

The Karcher foam lance provides controlled foam application with an adjustable nozzle and dilution settings to tailor foam thickness and detergent consumption. Its design is compatible with standard pressure-washer lance connections, enabling straightforward installation and use. The lance supports more even detergent distribution across surfaces, which helps reduce the amount of mechanical scrubbing and shortens overall cleaning cycles. Constructed with parts suited for cleaning chemistry, it offers reliable performance when used with recommended detergents.

Suitable for

• Pre-washing and degreasing of cars, motorcycles and commercial vehicles
• Applying foam to building exteriors, patios and driveways
• Cleaning industrial and agricultural machinery and equipment
• Preparing surfaces for further treatment such as pressure rinsing or manual detailing

Key specifications

• Brand: Karcher
• Manufacturer part number (MPN): 6.394-668.0
• EAN: 4039784401549
• Type: Foam lance for pressure washers (professional foam sprayer)
• Function: Produces adjustable thick cleaning foam for improved detergent coverage

How to use

Attach the foam lance to a compatible pressure washer wand according to the pressure washer manufacturer’s instructions. Prepare a foam-compatible detergent solution at the recommended dilution for the chosen cleaning task, pour into the lance’s reservoir if applicable, and set the dilution and nozzle adjustments to achieve the desired foam thickness. Apply foam evenly across the surface from top to bottom, allow the detergent to dwell for the manufacturer-recommended contact time, then rinse thoroughly with the pressure washer or proceed with additional mechanical cleaning if required.

Usage recommendations

Use detergents specifically formulated for foam lances and follow dilution guidelines to prevent damage to surfaces and the lance itself. Verify compatibility with your pressure washer model and follow all safety instructions from the pressure washer and detergent manufacturers. Rinse the lance after use when switching detergents or before storage to maintain reliable operation.