The collars are excellent quality. Unfortunately, I cannot use them. They are the wrong size.
This collar for a #1 burner was out-of-stock in most online stores, so I’m glad Paxton had it and shipped it quickly. But, it only has about 1 1/2 revolutions of threads! It needs at least 2 1/2 turns of threads. Had to use plumbers tape to make it usable, but it is still a weak connection. Bought 2 and the other is unusable.