It looks to me like all you need is a fresh bit of duct tape
Seriously, remove the old one, measure the diameter of the cut out & the diameter of the hose it attaches to, and then buy a nice new one to replace it.
The screws appear to be rust free. Must be stainless steel! You could probably reuse them.If you don't reuse them, let me know. That stuff is approaching the value of silver.