EasyPro EPU18N UV Clarifier for Ponds up to 4000 Gallons Protective device built inside sleeve turns off power when top cover is opened Dual outlets--choose which side of the up is easiest for your plumbing layout, can be same side or opposite side True quartz glass sleeve, not cheap plastic like some other brands Multistep connectors for 3/4-Inch, 1-Inch and 1 1/4-Inch tubing; Tough impact resistant housings Weatherproof ballasts, 15-feet power cord, long lasting bulb, max flow 2100 gallons-per-hour