Grav Labs 7" Stax Flare Base w/ Coil & Shower Head Perc - Clear The STAX Coil Showerhead Base is 7" tall and made on 65mm tubing. The base's central perc cools the smoke as it travels through the coil before diffusing the smoke through the internal showerhead downstem. The showerhead base comes with a 14mm STAX Funnel Bowl and can accommodate any STAX percolator or mouthpiece. This base works best with approximately 3" of water