Wonder Light PC-12 12GPM UV Light 115V Description as follows: Stainless Steel Ultra-Violet Sterilizer PC-12: Kill bacteria and viruses without the use of chlorine or other chemicals! 12 gallons per minute maximum flow rate recommended. Inlet and outlet is 1 inch NPT. Heavy-duty 304 stainless steel UV is suitable for water pressures up to 100 PSI. Two end caps make it easy to access the lamp for changing from either end; not one end like some UV sterilizers. Convenient external ballast and power supply makes installation easy. Specifications: UV intensity > 30;000 Mj/Cm2; 100-240V 50-60Hz; 40 watts. Dimensions: 3 inches diameter x 36 inches length. Pressure drop less than 5 PSI at rated flow rate of 12 GPM. UV lamp is rated for 9000 hours which is approximately one year of continuous operation.