Original ModDog Nano 510 squonker connector with 22mm top cap. Information from the manufacturer:
No leaks thanks to three custom made gaskets. The gasket between top plate and vaporizer is optional. It is not fixed and can be removed.
Very high conductivity. The center pin on copper was hardened (almost as hard as steel) and then first silver plated and then gold plated. It is adjustable up to 5,5 mm from the connector top. Either from the top with a slotted screwdriver or an Allen key (1,5 mm) or from the bottom with the same Allen key.
Connector housing made of stainless steel. High thermomechanical Ultem® insulator reinforced with glass fibre. Large contact areas for sheet metal and solder lugs. Precisely machined threads.
Notes: Pin has left hand thread, solder lugs not included.