LSE Lighting compatible UV Bulb 22W for Purtest PT-8 Water Treatment GPH436 Brand: LSE Lighting Wattage: 22W - Bulb Type: Ultraviolet Germicidal UV Base Type: 4pin (4pins on ONE END) - Length: 17.17" This UV replacement lamp by (LSE Lighting brand) is 100% compatible for use with Purtest PT-8 Water Treatment system. All UV Lamps listed are compatible (LSE Lighting brand products). We do not sell American Water Service brand lamps. All American Water Service brand names, trademarks and logos are property of American Water Service.