Features: brand new and high quality The oxygen pressure reducing regulator uses a piston-type pressure reducing structure with a small volume. The pressure gauge uses high-quality glass, thick and anti-drop design, clear scale and high sensitivity. The pressure reducing for valve is made of high-quality brass, with high toughness, wear resistance, and more secure sealing. Oxygen flow meters are suitable for home, outdoor, plateau, and oxygen supply system to provide oxygen inhalation. You just need to connect it to an oxygen cylinder to adjust the flow of oxygen output, without worrying about the oxygen flow being wasted because of too fast oxygen flow. It regulates the variable inlet pressure to a stable outlet pressure as much as possible. Specifications: Material: Metal Size: 14.7cm/ 5.78 in Package Includes: 1x Oxygen Pressure Reducing for Valve note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.