At first I thought these were a gimmick. But, I have found them to be very nice to use to fill the 510 tank and ego tank cartridges. No more mess getting liquid on your hands when you pull off the tank cap. Simple pull the cartridge off and insert the needle into the atomizer tank hole and fill!

The 5ml e-juice injector with blunk 18G needle is ideal for filling or refilling ejuice into electronic cigarette cartridges. With a safe blunt 18 gauge needle, e-juice injector is safe and convenient to carry or use.