Quartz Tube, Fostoria, Size- 5/8 IN, 480 V, Frequency Rating- 50/60 HZ, 2250 WTT, Style- Coiled Element with Porcelain End Caps and Pigtailed Termination, Insert Length- 50-11/16 IN, Housing Quartz. For Use With OCH-57 Series Outdoor/Indoor Rated Quartz Electric Infrared Heater