Made of good quality plastic, wear-resistant, corrosion-resistant, durable. Nice hand feeling, non-slip to hold, smooth to adjust. Manually control the CO2 On/Off regulator. Easy to install and use, just cut the hose and plug it into the valve switch seal. Strong sealing, good quality, high pressure resistance, not easy to trip. Optimal copper material, no burr, long service life. Suitable for 6mm hose, suitable for aquarium. Delivery quantity: 1 piece