This economical coupling system insures that your tote or drum set-up is a completely closed system, perfect for DEF. When you disconnect the female coupler from the male adapter they both seal shut eliminating any chance of spills. This system includes a male valve with 2" buttress threads that screws into your tote or drum. Also included is a female coupling with 90 degree 3/4" hose barb to attach to your pump inlet via a hose. Hose not included.