The SubCage is a stainless steel protective cage designed to enjoy the Sublimator without getting burned. It fits any Apollo and Dabmaster heating unit. The SubCage is sold separately without any heating device. Installation is easy. You have to unscrew your cold heating unit, insert your SubCage and screw back the heating device when installing. This cage does not inhibit in any way accessing the heating element for concentrate usage and offers extra safety and security for the user.