Pulsar Sipper Replacement Glass Bubbler - It is made from quality borosilicate glass, the Sipper Bubbler Cup adds water filtration to the vaping experience, giving you a smooth vape for concentrates and 510 cartridges. The bubbler cup is meant to be used with the Sipper's Auto-Fill function to collect vapor with the push of a button then it can be easily removed to sip at will.