Apparatus for filling devices that are penetrable for filling the devices with a substance, and resealable for sealing the resulting hole. A device support supports at least one such device in a substantially fixed position relative to the support during filling and/or resealing. A manifold drivingly mounted over the device support can include (1) a cartridge including a filling needle for penetrating a resealable stopper and introducing a substance therethrough into the device, a mount for mounting the cartridge on the manifold, and a removable cover releasably coupled to the mount for covering the filling needle during transportation, installation and/or removal of the cartridge from the manifold. The manifold can include a thermal source for heating a penetrated region of the stopper and, sealing the hole.