PAX 3 Concentrate InsertPAX 3 Concentrate Insert Expand the capability of PAX 3 by making it a dual use vaporizer with the PAX Concentrate Insert. The PAX Concentrate Insert is an insert, that when snapped into the PAX 3, allows for the vaping of liquid and solid concentrates. Simply load the insert with a small amount of concentrate, replace the original chamber lid with the insert, and start vaping!