BAADER SCT 2" CONTINUOUS MALE THREAD

This handy adapter from Baader features a continuous male 2"-24 Schmidt Cassegrain thread, as well as an M48 x 0.75 female thread on the inside for connecting a 2" filter. 

There are many instances where one needs to convert a female 2" SCT thread to male, and this adapter solves the problem. You can also convert accessories with a 2" SCT thread to an M48 connection.