Hi,
I have a spare one of these. It's a nice replacement for the 2 inch adapter attached to the focusers of skywatcher newtonian telescopes. It has compression ring inside to hold 2 inch accessories. M54 thread to connect to focuser.
Description here:
https://www.firstlightoptics.com/ada...actor-m54.html
$50 posted in Aus
Thanks for looking