Supreme Hydroponics Submersible/In-Line Grower’s Pumps are designed for submersible or in-line use (in-line adaptor included) and are suitable for ebb & flow use. These pumps have adjustable flow control and are oil free using mag-drive technology. Includes 1/2 in, 5/8 in and 3/4 in threaded tubing adapters. 15 foot power cord.