O-ring 88x2mm

O-ring 410211 with an internal diameter of 88mm and a cross-section of 2mm is a static seal for the Kranzle pressure washer. Verify the installation position on the disassembled machine or in the service documentation for the specific model.

Application

The O-ring is mounted in a sealing groove between two stationary surfaces – typically between a cover and the pump housing, a head and the valve block, or a cap and the crankcase housing. Compressed in the groove when the retaining screws are tightened, it fills the gap and forms a barrier against the working fluid or oil. The correct groove dimension is critical – an O-ring with the same internal diameter but a different cross-section (e.g. 2.5mm instead of 2mm) will not seal correctly in the same groove.

Replaced when the joint in which it sits is opened – as standard at every service that opens that connection, regardless of the visual condition of the O-ring.

Symptoms – when to replace

• Oil or water leak in the area of the cover or cap from which this O-ring comes – particularly visible after the washer has warmed up, when the fluid has lower viscosity.
• O-ring hard, brittle or permanently deformed on removal – the rubber has lost elasticity after prolonged use and will not return to its sealing shape even after reassembly.
• Visible flattening without resilience – O-ring permanently compressed in the groove, does not spring back to its original 2mm cross-section on removal.
• Cracks, pitting or surface damage visible to the naked eye after disassembly.
• Leak appears after reassembling the joint using the old O-ring – even without visible damage, an old seal does not give a reliable seal after having been relaxed and recompressed.

How to select the right part

Both dimensions must match simultaneously: internal diameter 88mm and cross-section 2mm. Changing either dimension means a different part – an O-ring 88x2.5mm or 90x2mm is a different seal, incompatible with the same groove.

Before ordering, measure the removed O-ring with a calliper: internal diameter (in the free position or on the groove) and wire cross-section – on worn or compressed O-rings the measurement may underread the cross-section, so allow for this effect when interpreting the result. Alternatively, measure the sealing groove in the joint: groove width corresponds to the O-ring cross-section, and its diameter determines the required internal diameter of the O-ring.

Identify by reference number 410211 – the Kranzle catalogue number is a more reliable basis for selection than dimensions alone, particularly when the groove is difficult to access for measurement.

Compatibility

Static seal for Kranzle pressure washers. Verify the exact installation position and compatibility range by reference number 410211 and dimensions 88x2mm.

[faq]

Can an 88x2mm O-ring be substituted with a flat gasket cut from technical rubber of the same thickness?|No – an O-ring and a flat gasket are two different sealing solutions with different groove requirements. An O-ring requires a precisely profiled groove in which it is compressed to a specific degree. A groove designed for an O-ring will not provide the correct contact pressure for a flat gasket, and vice versa. For a joint designed for an O-ring, the only correct solution is an O-ring with the correct dimensions of 88x2mm.

How to measure an O-ring that has been compressed in a groove for a long time and may have a reduced cross-section?|An O-ring after prolonged use in a compressed state may not return to its nominal 2mm cross-section on removal – you may measure, for example, 1.7–1.8mm. Measure the sealing groove instead of the O-ring itself: groove width corresponds to the nominal O-ring cross-section, and its diameter determines the required internal diameter. This is a more accurate selection method than measuring a worn seal.

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