It's one of many tip-types used on the end of the Wand on a Power Washer. YOu can buy them separately if you want to do this job yourself. If you can't find one, ask any Rental Agency where they get theirs or ctc. the Mfgr. of your Washer.
My best to ya and hope this helps.
Jay J -Moderator
PS: I've never had to buy one. I got one w/my Pressure Washer ...