Mike, your comment concerning the single 'O' ring seal breaking after a very short space of time is very accurate - I used this washer for the second time in 6 years and this 'O' ring split. I took the white-coloured part with the 3 'O' ring seals to http://www.flowseal.co.uk/. They measured the white-coloured part and the broken 'O' ring seal and sold me a minimum order quantity of 100 of replacement 'O' ring seals for £6 inc. VAT. These looked to be just what I was looking for. However, when I used the pressure washer with the replacement 'O' ring fitted, the pressure washer blew part of the 'O' ring seal out of it's seat and valuable pressure was lost. Will post any solution I find to the problem. If you would like me to supply you one of these 'O' ring seals, post your phone number in an answer and I will make contact.
Richard, April 2011