Directly from the manufacturer, the company Stealth Vape in England - the Source 510 Connector V2.
Equipped with 22mm, 24mm, 25mm or 30mm Top Cap, each as a "Flat Top" i.e. without cutouts. Since the Top Cap is only 1mm thick, it is not necessary to make a recess in the housing.
With 22mm Top Cap also in black.
The connector can be soldered without disassembly. Use flux and do not exceed the melting point of PTFE at 327 ° C.