The Black Diamond Pressure Regulator helps you control and fine-tune your compressor’s output so each air tool gets the right amount of pressure for the job. Built to control and regulate airflow for consistent tool performance, it lets you adjust pressure to match specific air requirements. It features a 1/4 in. NPT inlet x 1/4 in. NPT outlet with a 1/8 in. NPT gauge port and is made from high-grade materials for durable, dependable operation.