Flex CSST pipe

I don’t believe you can run the CSST through wall like this?
Recommend qualified plumbing contractor properly replace with solid pipe"

CSST can pass through a sheetrock wall without a sleeve as long as the plastic coating is intact and there are no connections within the wall cavity. If it goes through masonry or brick walls, it must have a sleeve. This is from Gastite tech support a while back.

Are you sure that is CSST? Looks more like an appliance connector. That cannot be run through a wall.

That is not CSST. It’s a flexible appliance connector. An appliance connector cannot run through walls or partitions.