GRAV® 3-in-1 Multi-Purpose Kit made on 32mm tubing with 14mm joints and attachments including 90° angled taster head, hammer bubbler head, vapor nozzle, 14mm plastic joint clamp, and marble-sealed glycerin mouthpiece.The GRAV® multi-purpose kit is 8" long and made on 32mm tubing. Its mouthpiece is filled with glycerin, which can reach sub-zero temperatures without freezing. The kit's three attachments pair with the mouthpiece: a 90° angled taster head designed for use with small amounts of plant matter, a hammer bubbler head designed to offer water filtration, and a vapor nozzle designed for use with plant extract. The connection between an attachment and the mouthpiece is secured by a 14mm plastic joint clamp. The kit includes everything necessary to build all three assemblies, and the bubbler attachment functions best with approximately 0.5" of water.