The G19 and G20 atomizer for wax are pretty much identical except the G19 has a screen over the coils while the G20 has no screen. These both have longer neck and neck cover with spring. Compatible with: Micro G Pen, Dripstick, Thermo, Cloud Vape, Sutra Pen, Dab Master 710, Power Pen, Pulsar Ninja, Perfection Pen and many more!