It should be loose so you can remove it and throw it away. It would interfere with the new bolts anyway.
Licensed residential and commercial plumber
Originally Posted by Terry
The gray plastic is there to prevent the tile guy from going right up to the valve. It can be thrown away. It serves no purpose now.
Its also a thin wall mounting bracket/support. It stays on the valve and supports the fiberglass from behind. Sounds crappy.....yep I agree. LOL