Lightly used Atik ATK-MFW 1.25" 5-position filter wheel with 1.25" nosepiece and T-mount threaded tube with lock ring as shown. There are female T-threads on both sides of the body and the camera side has an adapter in it that is all male T-threads with a lock ring to accept your T-mount. Current internet prices for a new one range from $163 to $193 but all are listed as unavailable or not available anymore. 

We have been on Ebay for 24 years in the form of Oddog2 (24 years, feedback 23,279 @ 7/23) and Camerabooks (three years, feedback 356 @ 7/23) so buy with confidence. We have created this new Ebay store "Oddog Astronomy" to focus on astronomy equipment, which we have dealing in mostly outside of Ebay for 15 years. We have been on Cloudy Nights ("Tom Duncan") and Astromart ("Oddog") for 15 years.