4 port air line splitter allows up to 4 air tools to be run off of 1 air compressor at the same time. Factory tested to assure leak-free operation. 4 universal push-to-connect couplers for ease-of-operation. Liquid-filled gauge for durability and more accurate reading closer to job site. High-flow regulator for increased performance. Quadraport can operate at 2 different psi settings at the same time for a wider variety of applications. 3/8" diameter inlet fitting allows higher air flow and reduces psi drop when used with 1/2" diameter hose. Robust carry handle for added protection. Hang holes for convenient, secure remote positioning. 3/8" in and 1/4" out.