Check the listing for details. Water Master WMW8LMP, 8GPM UV Replacement Lamp for Model# WMW8E. Condition: New. Listed at 19.99 USD. You are purchasing one unit of the Water Master WMW8LMP, 8GPM UV Premium Compatible Lamp for Model# WMW8E UV BulbReplaces Water Gem HG USA product10,000 Hour Long Life Lamp 12 Month WarrantyIncludes Free Gloves for Handling 21 Watts UV Hot Cathode Germicidal UV Bulbs (UV-C), are low-pressure mercury arc lamps that are the most effective tool for eliminating microorganisms such as virus, bacteria, mold and yeast in the air and impurities in water. Produces UV-C (253.7 nm wavelength) radiation (harmful to eyes and skin). Specifications:PART NUMBER: WMW8LMP, WMW8 LMP, WMW8-LMP, WMW8 WATTAGE: 21W AMPERAGE: 0.425 AVERAGE LIFE: 10,000 Hours BASE TYPE: 4 Pin PIN PATTERN: Square Box BULB SHAPE: T-5 (T5) T5F LENGTH: 17.6 in. FAMILY: Germicidal UVC LampsDIAMETER: 0.5 in (15.mm) ULTRAVIOLET PUTPUT: 6.4 Watts ENDS: Single End BULB FINISH: Clear BURNING POSITION: Universal Burn OUTPUT: UV-C SPECTRAL PEAK: 253.7nm Compatible Bulb Guaranteed to Meet or Exceed Manufacturers Specifications and Performance. Buy Wholesale from the Importer. We stand behind our products and Guarantee Same day Shipment and 100% Buyer Satisfaction. All lamps are brand NEW, packaged individually and are 100% Guaranteed