Sealing Sleeve 12mm

The hard 12 mm cup seal with dimensions 12×20×5.3/2.8 is a sealing element used in the working section of a high-pressure pump. Its role is to maintain tightness in the pump operating area, supporting stable working pressure and reducing leakage during use.

MPN / reference: 43.075
Dimensions / size: 12×20×5.3/2.8
Weight: 0.001 kg

APPLICATION

Cup seal used in service work on pumps and pressure washers, including:

• replacing the seal in the piston section / pump head,
• pump refurbishment during repair work or periodic inspections,
• eliminating leaks in the pump section that affect operating parameters,
• servicing sealing components during typical high-pressure system repairs.

SYMPTOMS - WHEN IT’S WORTH REPLACING

Common symptoms of cup seal wear:

• water leaks around the pump or under the unit,
• drop in working pressure despite functional accessories,
• jet pulsation and pressure fluctuations during operation,
• moisture on pump components after downtime (leaks appearing “later”),
• visible profile damage after disassembly (wear marks, chipping).

HOW TO CHOOSE THE RIGHT PART

Selection must be precise - similarly sized parts may differ in profile and working height:

• by dimensions: 12×20×5.3/2.8,
• by manufacturer MPN / reference: 43.075,
• by comparison with the removed part: verify shape and working profile before installation.

Accurate fit is critical for tightness and durability - profile differences often result in leakage or rapid wear.

COMPATIBILITY

Seal described for use in the Kränzle HOME K 1050 series. For safe selection, confirm compatibility by MPN 43.075 and the 12×20×5.3/2.8 size in the pump documentation/parts table, or by comparing with the removed part.
Selecting only by the machine name without verifying reference and dimensions is not recommended.

[faq]

Will the 12×20×5.3/2.8 cup seal fit every “12 mm” pump?|Not necessarily. Fit depends on full dimensions and seal profile. The safest approach is selecting by MPN 43.075 or comparing with the removed part.
What does 5.3/2.8 mean in the cup seal dimension?|It indicates the element height/profile. In service practice, even a small profile difference can cause leakage, so the part must be selected exactly to specification.
Can I use an aftermarket alternative for this seal?|Yes, but only if the alternative has identical dimensions and profile and is rated for high-pressure systems. If unsure, base the selection on the MPN and pump documentation.

[/faq]