Uv Clarifier - 5 Watt High clarity quartz glass tube. Includes mounting brackets. Minimum bulb-to-water-jacket distance for efficient water treatment. Weatherproof power cable. Transparent inlet-outlet allows for easy viewing of flow rate and bulb function. Delivers full power from PL-S high efficiency Ultraviolet bulb (included)UL&gt;TetraPond GreenFree UV M