The #127 DALSTAR type adapter isa mounting adapter to attach specific #3 shutter housing types to user equipment fitted with a M72 x 0.75mm pitch thread. The adapter can be attached to the #3 housing rear surface via the 2.00 inch x 40 TPI optical thread. The #127 adapter is recommend for use with VS25, VS35,and CS45 series shutters equipped with the #17 âFâ Type Video Adapter.