The thing you have circled is a vacuum breaker that is required by the plumbing code. It prevents water from backing up into the house and contaminating the water. It is designed to not be removable. It is held on to the hose bibb with a set screw that cannot be unscrewed. But, you can remove the vacuum breaker by cutting it off with a Dremel cutting tool. If you want to try it, there are Youtube videos that will show you how. Personally, I would not attempt to replace the entire hose bibb, because I doubt that it is just screwed on. It is probably glued on. Better to just pay a plumber to replace it. I also recommend Mike Scott plumbing. Good luck.
Last edited by retiredguy123; 01-03-2019 at 04:17 PM.
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