CLEARANCE Purely UV 18W (watt) 2G11 base hot cathode germicidal UV bulb (UV-C), low-pressure mercury arc lamp. Effective for eliminating microorganisms such as virus, bacteria, mold and yeast in the air and impurities in water. In the water, clarifiers cause algae to clump for easy removal by pond filter. Bulb MOL (length) 8.75", bulb life 8000 hours, pin pattern: straight line. For best performance and longer life, keep bulb clean, do not fingerprint. Manufacturer: Purely Products. Manufacturer 1-year warranty. Replacement cross-reference: Purely PUVG1118; Aqua Medic - Helix Max; Cal Pump - Biofilter BF2000, U.V. Clarifier UV18; Commodity Axis - ViaAqua Terminator UV Sterilizer; Coralife - Turbo-Twist UV Sterilizers; Custom SeaLife - Double Helix UV Sterilizer; ESU Pondlife - Turbo-Twist 6X UV Pond Clarifier; Garden Treasures - 18-Watt In-Line UV Light manufacturer 60031, Biological Pond Filter (Lowes 60030) manufacturer BF1000; Honeywell - UV Airvent Kit Air Treatment System; Jebo UV Ultraviolet Sterilizer UV-H18; OASE - Bitron 18C UVC Clarifiers; Pondlife - Turbo-Twist UV Pond Clarifiers; Tetra Pond UV-2 Availability: gone when listing sells out -------------------------- Please contact us with any questions prior to ordering. Items are stored in a temperature controlled, smoke free warehouse. Ships with packing list that shows pricing. Handling Time is same business day if before carrier pickup, cut-off time is 2:00pm CST, however, it is possible orders after cut-off ship same day depending on what time carrier pickup occurs. All orders receive a tracking code and ship from Illinois. Same day shipping is a best effort, not guaranteed, due to carriers sometimes arriving unusually early for pickup, we have no control over shipping carrier operations. Situations easily fixable by contacting us for help... 1) Shipping damage; contact us with photo(s) of the damage, then we can work on resolving the situation. 2) Order pulled wrong; contact us with the UPC or part number of what you did receive. 3) Defectives are very rare and handled as warranty by manufacturer, supplier or seller. 4) New items are typically warranted by the manufacturer or supplier, often contact information is on the packaging or user’s manual.