Liquid contacts only tubing.Outputs to 2.3 GPD.Available in standard, deluxe or external output control models.All pumps feature 3/8" tube nut connections.115 V/60Hz standard motors.Solid state output adjustment in one-minute, or five second intervals.Self priming, even against line pressure.De-gassing valve design eliminates gas or air accumulation in head.Precise output control by means of a digital touch pad wit LED readout (Deluxe models) or, percentage controller (Standard models).Weather proof, NEMA 3R.Advanced cooling, efficient, longer lasting.Silent alarm warns of pump tube failure.200:1 output rate adjustment (on Deluxe models).All ball bearing motor for smooth, powerful operation.