where do I find a 9.036 - 703 Connector?

Your question is in the Chainsaw category but no matter.

The connector you want appears to be for water rather than electricity.

E-spares will sell you one for £3.99 - I found it using google - a most useful tool...

Manufactured by Karcher Part No. 9.036-703.0
sadly though currently out of stock

http://www.espares.co.uk/part/garden-and-outdoor/karcher/p/7/877/0/0/538457/pressure-washer-outlet-co.html

Good luck...

Peccavi
April 2010