Package includes: 1 x 1/4 pressure reducer for compressed air (4 holes), with pressure regulator and gauge compliant with EU standards, 1 x plug (can close one hole, converting 4-hole pressure reducer to 3-hole pressure regulator, leak-free), 1 x high-quality adhesive tape. High-quality material: The air compressor pressure regulating valve is made of high-quality metal material, strong and durable, not easily damaged, with good sealing performance. Precise scale: The pressure reducer gauge features a precise scale for easy reading and accurate pressure adjustment. Function: The valve can be used to set and monitor pressure values on the gauge to control the starting and stopping of the air compressor. Easy to install and remove: The 1/4 pressure reducer can be directly screwed onto the threaded connection of the compressor and other machines, making installation and removal simple. Supports free conversion between 3-hole and 4-hole configurations to meet different requirements.