Help with odd fitting size?

Hi folks,

Recently acquired this electric pressure washer, but him I’m having a heck of a time finding any kind of adapter that fits the hose end.

I instinctively thought it was 1/4", but none of my 1/4" Quick Connect adapters fit it, mostly because the groove is too small for the ball bearings.

Anyone seen this size before and know what it is? I would be terribly grateful to know! Many thanks in advance.

looks specific to a particular brand. does either end fit the pressure washer you got?

Yep. It fits the machine and the gun, but that’s all I’ve found it fits!

Anyone? Anyone? Bueller? :confused:

I’m no expert, but that looks like a M22 fitting… is this off an electric pressure washer? What brand/model?

Look into something like this:
Expensive

Cheap

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Yes, it’s an Alaintool, off of Amazon.

From hunting through brands in your “cheap” suggestion, it really appears to be a Bosch attachment!