Liquid Dynamics DrumQuick Pro DEF coupler system for 55 gallon drums. The system comes with a DrumQuick Pro coupler with 3/4 in. hose barb outlet. The system also includes 2 valves one fits a 2 in. female NPT opening and the other fits a 2 in. female Buttress opening. The suction tube is a press fit in the valve and is 35 in. in length for 55 gallon drums.