The Tru-Flate Design Plug is recognized by the extremely short pilot; however, it has the widest metal section between the groove and the pilot. The sealing surface on the end of the plug is wider than  other interchanges, resulting in better sealing and longer seal life. The Tru-Flate Design Coupler utilizes the tubular valve which supports the seal and allows more air flow at lower pressure drops than most competitive couplers.