how do you connect the Katcher KB90 hose to the handle?

Answer 1

there should be a water connector,, maybe its black, pull it towards you, then connect

Answer 2

I could not find reference to a Karcher KB90.

Since if you had a Karcher Pressure Washer, Karcher Hose and Karcher Spray Gun it would be obvious how to assemble them, I suspect at least one item is not made by Karcher.

You are probably suffering from a rather common problem.

Most pressure washers made for use in the USA commonly have 3/8 FNPT inlet on the Spray Gun with a 1/4 FNPT outlet for attaching the lance (wand).

Karcher is a GERMAN manufacturer, who has their own connection system. Their hoses use a swivel nut FEMALE M22 end connection on the hose (that follows a 22mm metric standard), rather than the Male NPT common on most hoses on systems used the USA.

So that a hose designed for the Karcher system will not directly connect with one using NPT threads (or Pressure Washer Quick Disconnects).

Adapters for converting the connections in either direction are usually available from the larger pressure washer distributors. This is so common a problem for a pressure washer distributor, that they should be able to help you through it.

Unfortunately, that is not true of the average hardware store or chain merchandizer.

Good Luck

Answer 3

No offense but I have a KARCHER.

Handle? meaning the trigger/spray/nozzle device?

Certainly on the end of the spray attachment and both ends of the delivery line, there is a fitting that accepts another threaded fitting either male or female, that threads into the Pump line outlet, as well as the nozzle/trigger/handle. There are also fittings sold to make quick connect release/ Spring snap type, much like those that can be used for the inlet water line as well. Similar designs are used in air compressors/ paint sprayers etc.

Steven Wolf