iJoy Capo Squonk is latest squonker box mod from ijoy, the first squonker compati with 21700 as well as 20700. More details will be coming out. 

Squonking is a form of vaping that alters the e-liquid delivery mechanism. To squonk you need a squonk mod or bottom feeder mod. This mod carries an e-liquid bottle onboard and allows you to directly feed e-liquid into the atomizer. No more need to drip into your RDA. 

Finding the squonk mod is just half of the work, though. You need a squonk tank which support is and is meant for squonking. iJoy Capo Squonk is a good choice.