Very good surface cleaner..I would certainly recommend it.

T-Racer T 7 Plus Surface Cleaner is designed to be compatible with Kärcher K 4 to K 7 series pressure washers. However, I do not have specific information regarding its compatibility with the HD 650 model. It is possible that the fittings are not directly compatible, but this would depend on the exact specifications of the HD 650 model. I recommend that you check the technical specifications of the product or contact a Kärcher dealer for more precise information.

I have a Kärcher that is about 30 years old and the cleaner is perfectly compatible, I believe the attachment also works on older models.

Yes this one fits any Kärcher. The connections are all the same, only Kärcher.

Not possible, different connection type!

Suitable for high-pressure cleaners of classes K 4 to K 7

You can certainly get more done with the surface cleaner than with a steam cleaner. Note, however, that this product is an accessory for a high-pressure cleaner and you need a compatible device for it. And I think it's a bad idea to use a pressure washer indoors... I use it myself on the balcony for the concrete tiles.

See description. Only K4 - K7.