LSE Lighting compatible UV Bulb 25W for PenTek UV System 20-463 Bulb Type: Ultraviolet Germicidal for Water Filtration Systems Wattage: 25W, Base Type: 4pin (4pins on one END) Overall Length: 17.17" (436mm) This UV replacement lamp by (LSE Lighting) is 100% compatible for use with PenTek UV System 20-463. All lamps listed are compatible brand (LSE Lighting) UV products. We do not sell Pentair Water/Pentek brand lamps. All Pentair Water/Pentek brand names, trademarks and logos are property of Pentair Water/Pentek.