describe Scope of delivery: 1 compressed air pressure regulator 1/4 (4 holes) with pressure regulator and pressure gauge according to European standards, 1 cap (can close a hole, can reduce the pressure to 3 holes, no leak), 1 adhesive tape. High Quality Material: The air compressor pressure regulating valve is made of high quality metal material, which is durable, not easy to damage and has good sealing percompatiblemance. Accurate scale: The pressure reducer pressure gauge has an accurate scale, you can easily read the pressure value to set and read the data. Function: According to the value on the pressure gauge, the valve can be used to adjust the closing and starting of the air compressor. Easy to assemble and disassemble: The 1/4 pressure reducer can be directly screwed on the threaded interface of the compressor and other machines, which is easy to disassemble. The 3 holes and 4 holes can be freely converted to meet your different needs. Needs.",