The Amphenol AC-NUT-VIO is a violet thermoplastic backshell for Amphenol's AC series XLR cable connectors: the rear nut that screws onto the connector body, holds the insert in place and grips the cable via its grommet. Swapping the standard black backshell for a coloured one is the usual way sound, lighting and broadcast crews colour-code XLR looms, so that channel numbers, circuits, DMX universes or cable lengths can be identified at a glance on stage or at a patch bay. It is also a cheap repair part when a backshell has been lost or cracked, avoiding the need to re-terminate or replace the whole connector. It fits the Amphenol AC series XLR plugs and sockets (for example AC3F, AC3M, AC4F and AC5F) rather than other brands' connectors. Amphenol lists the housing material as thermoplastic and sells this part in its catalogue as a 100 pack; confirm whether this listing is a single piece or a pack before ordering in quantity. Other colours are listed separately.