Universal Regulator: 4-port, two 1/4" FPT ports and two 1/8" FPT ports (gauges sold separately).
NOTE: If replacing this on older Craftsman "919" model air compressors in which TWO gauges are installed on the Regulator, ONLY ONE OF THE AIR PRESSURE GAUGES WILL WORK WITH THIS REGULATOR; modification may be required.
Don't ruin your equipment, supply just the right amount of PSI to your tools with the regulator. A pressure regulator can be used on portable and stationary units and installs in-line. Don't forget your gravity water/particulate filter so you have clean, dry air to your line. Replace this if you can no longer regulate the exact amount of pressure you need to your line, or if it leaks. Be sure to check the accuracy of your regulator gauge periodically.