The maglock intake works opposite of the Maglock Cap. Where the Maglock Cap stops the air flow on a split line so that CFM are not coming from where they're not needing, the Maglock Intake allows air to flow into it. This would be necessary if your dust collector is too good for the application. By adjusting the Maglock Cover (yellow) you can tune how much air is coming into the hose, and how many CFM is being syphoned off. 

Includes the Body, Cover, and (2) MagLock Rings

In no particular order you need to slap the Yellow Cover (if it didn't arrive already done), and glue the MagLock Rings with the magnets opposing each other.