This tool is made of high grade stainless steel material, which is anti-corrosion, abrasion resistant, glossy and durable. High quality stainless steel needle micro-metering valve with high precision, easy to release CO2 by fine tuning. Special metal-grinded surface, light weight, easy to operate. Features: 1. Made of high grade stainless steel material, which is anti-corrosion, abrasion resistant, glossy and durable. 2. Ergonomically design, easy to install and convenient to remove. 3. High quality stainless steel needle micro-metering valve with high precision, easy to release CO2 by fine tuning. 4. Special metal-grinded surface, light weight, easy to operate. 5. Different styles to choose, meeting your different demands. Specification: Item Type: Aquarium System Accessory Material: Stainless Steel Optional Style: 01#Single Head Micro-metering Valve for Gauge, 02#Dual Head Micro-metering Valve for Hose, 03#Single Head Micro-metering Valve + Bubble Counter, 04#Dual Head Micro-metering Valve + Bubble Counter Item Color: As Pictures Shown Package Weight: Approx. 47-83 g / 1.6-2.9 oz Package Include: 1 * Aquarium System Accessory 1Made of high grade stainless steel material, which is anti-corrosion, abrasion resistant, glossy and durable 2Ergonomically design, easy to install and convenient to remove 3High quality stainless steel needle micro-metering valve with high precision, easy to release CO2 by fine tuning 4Special metal-grinded surface, light weight, easy to operate 5Different styles to choose, meeting your different demands