Foam lance base assembly

The foam lance base is the complete base unit of the foam injector, forming the “working body” of the accessory responsible for delivering chemical and mixing it with water to produce foam. In service practice, it is replaced when the foam lance base is mechanically damaged, leaking, or when the internal components do not operate consistently despite cleaning.

MPN / reference: 1353331

APPLICATION

The foam lance base unit is used in pressure-washer accessories for:

• use with detergents intended for foaming (pre-wash, main wash - depending on the chemical),
• servicing the foam lance after damage to the body, threads, or connections,
• restoring flow and stable chemical pickup in the foam circuit,
• rebuilding the complete base module when parts are missing or worn.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Replacement of the complete base unit is justified when the following occurs:

• no chemical pickup despite correct connection and a clear suction hose,
• irregular chemical pickup (sometimes foams, sometimes delivers only water),
• leaks on the body or at the connections of the foam lance base,
• damaged threads/connections causing misalignment and leakage,
• reduced foam quality after ruling out issues with the nozzle/foaming tip and filter cleanliness.

HOW TO CHOOSE THE RIGHT PART

Selection of the foam lance base should be unambiguous:

• confirm that you need the complete foam injector base unit, not a single seal or tip,
• verify the part number: MPN 1353331,
• compare it with the removed part: connection layout, body geometry, and mounting method in the foam-lance assembly,
• check whether the issue is not caused by external factors (clogged suction filter, leaking hose, contamination in the foaming nozzle).
• In foam accessories, differences in the body and flow passages can be critical, so choosing “by appearance” is risky.

COMPATIBILITY

The foam lance base should be selected by MPN 1353331 and compatibility with the specific foam lance / injector in the accessory set. The safest verification is comparison with the removed part and checking whether the remaining foam-lance components (tank, hose, foaming tip) are of the same version.

[faq]

Does “complete foam lance base” mean I get the whole foam injector?|The wording suggests a complete base unit (the working body of the injector). The scope of the remaining elements, such as the tank, depends on the specific design of the set, so in service the safest identification is by MPN 1353331 and comparison with the removed part.

The foam lance is not drawing chemical - what should I check first before replacing the base?|Check the suction filter, hose flow, sealing on the suction side, and whether the foaming tip/nozzle is clogged. Only after ruling these out does it make sense to suspect the base / injector.

What causes weak foam even though detergent is being drawn?|Often contamination in the mixing elements, incorrect chemical concentration, or restricted flow. If these factors are ruled out, the problem may lie in the channels or internal elements of the base.

Can I use a replacement foam-lance base with “similar connections”?|That is not recommended. Differences in passage diameters and mixing method can change chemical pickup and foam performance. The safest choice is MPN 1353331.

How should I care for the foam injector base so that pickup problems do not return?|After use, flush the system with clean water, do not leave detergent in the lines for long periods, clean the suction filter, and avoid drawing contamination from the bottom of the container. This limits deposits, which are the most common cause of unstable foam-lance operation.

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