Aquarium CO2 Pressure Regulator Check Valve Gauge Bubble Counter Mini Single Table Silver Features: 1. Single gauge display. Improved airflow for steady, reliable output pressures, and is small and lightweight.  2. With dial plate, the bubble recorder adjustment more accurate.  3. Easily to adjust, stable and accurate CO2 output. 4. Endure high-pressure design, without air leak. 5. Made of premium aluminum alloy material, which is anti-corrosion and rustproof.   Specification: Condition: Material: Aluminum alloy. Interface: G5/8 Regulator Valve: approx. 7.57 x 2.7cm/3 x 1.1in(H x Bottom Dia),  Bubble Counter: approx. 8 x 1.52cm/3.1 x 0.6in(H x Upper Dia) Weight: Approx.313g Package list:  1 x Regulator Valve 1 x Hex Wrench 1 x Bubble Counter 1 x Gasket