I think I viewed a set of maybe four or five chokes assembled as an RF choke in preventing common mode current form traveling down the coax. They were wrapped in a protective cover. Hopefully I’m on the correct web page for this product?
@DAVID_LINDSAY The Intellitron AA-3915 RF Isolator works in line with the coax. This is connector to connector fitting, with SO-239, which mates with your coax PL-259 connector. Also nice becuase you don’t have to modify your coax.