ALL TYPES  DRAIN OFFS

EXTENSION IS 65MM SO ALLOW THE 12MM LESS EACH END FOR TOTAL LENGTH   1/2 BSP F X 1/2 M  

LOCKSHIELD IS 1/2" X 15MM

22MM SELF CUTTING ADAPTER DOES NOT COME WITH BRASS DRAIN OFF PART YOU HAVE TO ALSO BUY 15MM SELF CUTTING 

NOT ALL SELF CUTTING 22MM ADAPTERS FIT 15MM DRAIN COCKS ON THE MARKET (BEST GET BOTH FROM ME  TO BE SURE THEY FIT)