Spacer Ring 20mm

The 20 mm plastic spacer ring is a service component used in high-pressure pumps as a shim/spacer within the pump assembly. It ensures correct positioning of cooperating parts, which is important for proper assembly and stable operation of the pump section.

MPN / reference: 400251
Weight: 0.001 kg
Dimensions / size: 25×3×25 mm

APPLICATION

Used in pump and pressure washer service work, including:

• assembly/rebuilding of the spacing system in the pump section,
• pump refurbishment after disassembly and replacement of sealing parts,
• replacing the ring when worn, deformed, or mechanically damaged,
• service operations where maintaining correct clearances and component positioning is critical.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Typical signs of wear or issues with the spacer ring:

• visible cracks, deformation, or abrasion after disassembly,
• difficulty assembling the pump section “in axis” or incorrect fitment of parts,
• recurring leaks after repair (when spacing affects seal operation),
• unusual friction or rubbing marks on cooperating parts,
• axial play / unstable seating of parts in the assembly (found during inspection).

HOW TO CHOOSE THE RIGHT PART

Selection should be accurate, as it affects assembly geometry:

• by manufacturer MPN / reference: 400251,
• by dimensions: 25×3×25 mm and the “20 mm” designation for the specific application,
• by comparison with the removed part: check thickness, diameters, and installation orientation.

Correct spacing is critical - wrong thickness can cause improper seal operation and faster wear of components.

COMPATIBILITY

Compatibility should be confirmed using MPN 400251 and ring dimensions per the pump documentation/parts table.
Selecting “by eye” based only on “20 mm ring” is not recommended, as different pumps can use different spacer thicknesses and diameters.

[faq]

What is the spacer ring used for in a high-pressure pump?|It acts as a spacer shim - it sets the position and gaps between parts inside the pump assembly. This affects correct fitment and indirectly impacts seal performance and component life.
Can I select the ring only by the 25×3×25 mm dimensions?|Dimensions are key, but the safest approach is to confirm selection by MPN 400251 and the pump documentation. In some assemblies, tolerances and exact thickness are critical.
Can an aftermarket spacer ring be used?|Yes, provided dimensions and thickness match exactly and it’s intended for the given pump layout. Incorrect spacing can disturb assembly and accelerate seal wear - therefore, the MPN and specification should be your reference point.

[/faq]