Aqua Twist Unit - 2" - White Body - 57 Watt with Wiper 57 watt TWIST Aqua Ultraviolet u.v. sterilizer with wiper. 2 inch inlet / outlet ports. Includes bulb and quartz sleeve. Lifetime warranty on housing. Aqua Ultraviolet Sterilizers will clear your water in 3-5 days sometimes overnight and keep it that way. Used as a sterilizer, the Classic 57 Watt UV is the premium choice for 1500-3000 gallons of fresh water or up to 355 gallons of salt water.