This banger attachment will never pop out while the silicone wall which firmly holds it in place is dry. Once the interior becomes slick, its possible for the glass to be push pulled out. If you use this attachment, just remember to clean, or make sure that the interior atomizer is clean before and after use. This is not intended to be a permanent replacement for the atomizer, but rather to hold you over if the device's battery is dead, your waiting for a replacement atomizer to come in. **Purchase Comes With ONE**