HEMPER Inline Hourglass RigDescription Don't waste your time on inferior glass, step up to the Hourglass Inline Rig. This dual chamber hourglass shaped rig features a classic inline percolator style that blasts smoke through cooling water to create smooth vapors. The pinch at the center of the hourglass shape acts a restrictor to create perfect airflow resistance and bubble stacking without any splash back. SPECS: Pitched neck Inline Percolator 8" Inches in Height 14mm Female