Measurements would help and a couple of different angle pictures. (clip system, does it release something through the wall of the unit?)
What you describe is called a cam lock it seems only one lock would discount that idea .It looks like the locking end of an irrigation pipe that’s been cut off. Sections would be lengths of up to 20 feet. They had a flared/bell on one end that would slip over the next pipes locking end and the dog would clip on to it. They are hand irrigation lines and the smaller ones ran off of a 6-8” mainline. Growers would water one side of the mainline one day and then roller was placed on the mainline and then the sections of hand line were pulled to the opposite side and water that section for a day. In orange groves here in Florida they were used often.
Just judging by the paver that pipe appears to be 3”.
That is not the type of locking systems I saw on irrigation systems here in the 1970’s. Our end plugs were different, some of the pipes used twist lock style connections. My input was what appeared to be to me, it very well could something else all together.
That device is an open sleeve. The umbrella rod passes through it. It allows you to adjust the height and lock the rod in place.Ok... found similar.... btw Anti... it not a patio umbrella.... its for beach... portable...
where was it said it was sealed on one end ? and is that just dirt ?That device is an open sleeve. The umbrella rod passes through it. It allows you to adjust the height and lock the rod in place.
The item in this thread is sealed on one end. It also appears to be about 2 1/2-3 inches in diameter. Quite large for an umbrella.