Black part of the assembly is typical sealant applicator, everybody knows how it works so I won’t describe it now.

The most important part is at the bottom. It attaches to standard 310 ml caulk cartridge. Sealant is forced to chamber with screw inside, in which it increases its pressure. Screw also set amount of sealant (according to wheel speed). Output sealant is shaped by replaceable tip.

Few advantages:
- increasing speed = increasing sealant output. Output depends of wheel speed (which is running on a surface)
- middle of the screw increases its diameter towards end, so the pressure of sealant increase towards end
- you don’t have to dirty your fingers, there is a replaceable tip which is shaping the sealant

Watch video with annotations.