Type 1 300psi regulator: You must know the following tips to build your project: 1. Please connect all parts first, then close this adapter to connect the paintball tank to expel CO2/air or start refilling. 2. When you are removing parts from a full air/CO2 tank or after refilling, please turn off the switch on the adapter, regulator or valve or unscrew this adapter to stop the air from venting before removing. Otherwise the air will be used up and dangerous. 3. Our 0-300 adjustable regulator with input pressure below 1000psi. How this works: To prevent the meter from exploding during installation, follow the instructions: 1. Turn the knob counterclockwise until the lever is fully released before venting, closing the regulator. 2. Then screw the regulator onto the HPA bottle. 3. After installation, the knob can be tightened clockwise to adjust the required pressure. But keep the pressure below 300psi or the gauge will burst. Type 2 0-1500PSI Regulator: You must know the following tips to build your project: 1. Please connect all parts first, then close this adapter to connect the paintball tank to expel CO2/air or start refilling. 2. When you are removing parts from a full air/CO2 tank or after refilling, please turn off the switch on the adapter, regulator or valve or unscrew this adapter to stop the air from venting before removing. Otherwise the air will be used up and dangerous. 3. Our 0-1500psi adjustable regulator with input pressure below 1000psi. How this works: To prevent the meter from exploding during installation, follow the instructions: 1. Turn the knob counterclockwise until the lever is fully released before venting, closing the regulator. 2. Then screw the regulator onto the HPA bottle. 3. After installation, the knob can be tightened clockwise to adjust the required pressure. But keep the pressure below 1000psi or the gauge will burst. Type 3 0-2800PSI Regulator: Output thread: G1/2-14 Input thread: 0.825-14NGO Input pressure: 3000psi Output pressure: 0-2800psi Pressure gauge range 0-5000psi You must know the following tips to build your project: 1. Please connect all parts first, then close this adapter to connect the paintball tank to expel CO2/air or start refilling. 2. When you are removing parts from a full air/CO2 tank or after refilling, please turn off the switch on the adapter, regulator or valve or unscrew this adapter to stop the air from venting before removing. Otherwise the air will be used up and dangerous. 3. Our 0-5000psi adjustable regulator with input pressure below 3000psi. Package Included: 1 * Regulator Note: 1.The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2.Please allow slight manual measurement deviation for the data. Made of high-quality materials for durability Adjustable Compressed Air Regulator for PCP Paintball Can So da Cylinders Model: 1# 300PSI for paintball tank, 2# 1500PSI for paintball tank, 3# 2800PSI for paintball tank (optional)