CO2 flow Regulator Needle Valve with Mini Gauge 0-2000PSI Gas flow Rate Control W218 Thread 1. Compact and Durable Design This needle valve features a mini gauge with a range of 0-2000 psi and an adjustable knob for precise control of the output flow rate. The valve's inlet thread is compatible with W21.8 treaded cylinders ( It's made according to UK, Europe standard. Please note this thread do not fit cylinder in USA and Canada) and it is constructed with an aluminum body and brass core, ensuring durability for long-term use. 2. Versatile Application The flow controller is designed for gas flow management, displaying the internal pressure of the cylinder on the gauge. It is ideal for controlling CO2 flow rates in both planted aquarium co2 systems, providing consistent 24-hour CO2 output, and for flow testing in laboratory settings. 3. High-Pressure Hose Compatibility The valve supports connection with a high-pressure hose, featuring a 4mm inner diameter and 6mm outer diameter. Note that this needle valve does not function as a pressure reducer and should not be used with timers, solenoid valvesor sealed containers designed for low pressure. It is intended for applications where non-blocking output is essential. 4. Smooth Adjustment The adjustable knob on the top of the CO2 flow controller is designed for smooth rotation, allowing for precise and effortless flow rate adjustments to meet your specific needs. Attention: This product is not designed for pressure reduction. Do not use it in a closed container that is not high-pressure resistant or with equipment that does not have a stable output. Whats in the package? 1 x Co2 Flow Regulator 1x O-ring for replacement _x000D_