This is a top mount, screw on, can taper.
It will screw on top of the new style "Self-Sealing" cans.
The hose connection is called 1/2" ACME with Right-Hand Threads.
Includes Cap with internal O-ring
It is very important to use the new correct can taper on the new "self-Sealing Cans" or you will damage the seal disk and the AC Coolant will leak out the can.