There's often confusion about eGO adapters.
This is an eGO Cone adapter for covering up and blending the look of a 510 thread carto on a non-eGO flush connector PV (what you'd use with a Lavatube for example). Note: If you want to put an eGO-T atty on a Lavatube, this
is not the adapter you want:
I have four different makes of eGO-T Type A tank attys....none of them have threaded skirts.
This is a 510 to 510 shorty extension for flush mounting an eGO-T tank atty on flush connector PVs. Note: There are slight variations in dimensions between manufacturers that affect connection and fitment integrity so it's pretty much a crapshoot which vendor has the right one that'll work in every case. If use ends up in an unsightly large gap between skirt and top of the PV, you can grind down the female end for better fitment. If the skirt contacts the the top of the PV before electrical connection is established....oh, well. Back to the drawing board.
Hope this helps prevent someone from wasting money on the wrong thing as I have in the past.