About This PRESSURE: Using this regulator can precisely regulate and maintain constant air pressure to your tools. Can filter small particles,dust and keep the air dry and clean. WAY TO USE: Pull the top button up and turn clockwise to increase the pressure, or turn counter-clockwise to release the pressure. CONVENIENT: Easy to install and remove. Easy to dispose waste trapped inside with drain valve. LONG SERVICE LIFE: Provide recommended air pressure required of air tools can make them work well and extend service life. PACKAGE: 1 x water-trap regulator filter, 1 x pressure gauge, 1 x metal bracket, 1 x English Instruction, a pair of 1/4" NPT Nickel-plated Iron Air Coupler& Plug Kit, 2 x PC6-02(6mmOD x 1/4 NPT), 2 x PC8-02(8mmOD x 1/4 NPT), 2 x 1/4" NPT Fittings, 1 x Teflon Tape. These connectors as additional accessories to help you more convenience in installation.