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Karcher Pressure Washer O Ring Kit Stock Number: ES537803

Karcher Pressure Washer O Ring Kit - ES537803

4.7 out of 5 Rated 4.7 out of 5(78 customers)

Keep your pressure washer hose and hand gun leak-free with these replacement seals

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Manufactured by Karcher

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Pressure Washer O Ring Kit

If you are struggling to control the leak from your Karcher hose, trigger gun or other Karcher accessories, eSpares has just what you need. This Karcher replacement o-ring kit offers you the leak free experience.

This Karcher O ring kit contains 16 o rings and 4 yellow rubber stoppers. The O rings consist of 5 different sizes to make sure you will always be covered no matter the accessory, no matter the size. With the rubber stoppers you will be able to use your Karcher accessories without the fear of a leak again!

With the help of eSpares and this fantastic accessory, you can soon be on your way to cleaning the garden in no time!


  • 16 O-rings (across 5 sizes)
  • 4 yellow rubber stoppers

Genuine spare part for select models of Karcher pressure washers.

Please check the suitable model fit list to ensure that this is the correct part for your appliance.

Karcher spares reference: 2.640-729.0

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Here’s what other people are saying about Karcher Pressure Washer O Ring Kit.

(78 reviews)

4.7 out of 5

Ease of fitting 5 out of 5
Quality 5 out of 5
Value 4 out of 5
  • Camberley, Surrey
    5.0 out of 5

    This item solved a big problem.

    Fitting these new inserts and o rings fixed the enormous leak from the lance and attachments. The lugs on the side of the inserts wear and become loose. The new inserts are tight and stay in place. A cheap fix to make the washer usable again.

    Ease of fitting 5.0 out of 5
    Quality 5.0 out of 5
    Value 5.0 out of 5
  • Huddersfield
    4.0 out of 5

    Excessive quantities

    Needed an O ring for both ends of the hose on a Karcher 670M. Didn't need the other 20+ bits in the pack. Fortunately the two I needed were there. I wasn't sure when I ordered that I would get what I needed.

    Ease of fitting 5.0 out of 5
    Quality 5.0 out of 5
    Value 3.0 out of 5
  • Norwich
    5.0 out of 5

    Pleased with purchase

    Very good product & looks well made. I haven't had time to fit yet but I'm sure that my pressure washer will be like new again when the new seal kit is fitted as it leaks in quite a few places since I have had it over the years.

    Ease of fitting 5.0 out of 5
    Quality 5.0 out of 5
    Value 5.0 out of 5
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Ask a Question

26 Questions and 26 Answers

By S Brown - Lancashire - 06 June 2016
  • I replaced the capacitor - my machine just stopped working - water flowed through fine at low pressure but the pump stopped. New capacitor solved the problem By DLP - woking - 01 August 2016
  • Chris from eSpares
    Chris at eSpares says...

    For information on your repair see our video: How to Diagnose Pressure Washer Electrical Problems:

Answer this question
By crippin - Pontypool Torfaen - 08 January 2012
  • you may have a leaking O ring By Clive - Swansea - 06 June 2013
  • Hi Crippen sounds like you have a fracture in the control head as I did, this opens when the machine builds up presure and then releases it through the fracture, it is likely the fracture is under the metal head plate used to secure the unit head hence you cant see it, I know your post is long ago but this may help others as when I read the posts on the espares site it was no end of help to me. If the seals are ok on everything else I suggest replacing the control head housing. By Rob - N Ireland - 08 January 2013
Answer this question

The Chemical Discharge bottle will continue to fill up without any power on and then stops as the pump uses the water with power. I reckon it is probably a valve maybe that feeds the clear plastic pipe. Can you advise please which part /valve requires replacing. Mine is a K6.50Mb unit.

By Mike - Manchester - 09 March 2016
  • Chris from eSpares
    Chris at eSpares says...

    The problem is likely to be caused by Stock Number: ES1751853 leaking.

Answer this question

Hi, I asked a question on here about 3 or 4 months ago, as having not used my pressure washer for some months it had started leaking. It made a rattling noise when I moved it. It was suggested the fault might be the O Rings. I have a Karcher extension hose between the front of the unit and the pressure gun. That has seized onto the pressure washer, and however hard i try i cannot shift it. As a result I hadn't got round to stripping the washer. Today I finally got round to trying to sort it. Two issues: 1. I cannot shift the hose from the washer. Any tricks to loosen this please (I have tried squirting GT40 in there, but it is not loosening); and 2. I opened the back off the machine. The noise is two screws about 9mm long and heads about 16-17mm wide rattling around inside. The motor and internal bits are not attached to the case in any way. Any idea where these screws are from, and is the motor supposed to be attached to the case. Do you still thing this is the O-Rings? Thanks for your help, Stuart

By Stuart - Harrogate - 06 February 2016
  • Chris from eSpares
    Chris at eSpares says...

    The motor appears to be clamped by the upper and lower cases and doesn't appear to have any fixing screws. To remove the hose try heating with a hair dryer to expand and soften the hose screw fixing.

Answer this question

I have a k2 411A washer which leaks and pulses only when the trigger is operated. 1) is it worth fixing? 2)where can I get the parts in the u.k? details are also... NR. 189164 K2 (1.994-972) 441198 19949720189164 I hope you can help Thanks Ashley

By Ashley - Somerset U.K. - 07 December 2015
  • Chris from eSpares
    Chris at eSpares says...

    The pulsing is due to the leak allowing the pressure to escape. Disconnect and remove the case then just connect the water to the unit to identify where the leak is occurring. We can supply the parts once identified.

Answer this question
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