I think you're talking about what I call "priming" the coil. I'm going to assume you're using a sub-Ohm (less than 1 Ohm) tank. Kanger, Aspire, Horizon Tech, etc. all make good 5mL sub-Ohm clearomizer (glass or Pyrex) tanks. I use an Aspire Atlantis Mega tank (5 mL). The coil just screws into the base, BUT you do want to "prime" the coil by taking your bottle of juice and saturating all of the cotton with juice. This will prevent a "dry burn" (heating up a coil with no juice on the cotton).