SH261--QUARTZ TUBE HEATERSupco® Universal Glass Heaters are designed to meet or exceed OEM specifications for superb performance and reliability. Constructed of high quality Vycor® glass with end seals of high temperature molded silicone.Features/Benefits:Heavy duty Vycor® glass constructionProtective oxide coated element wire for longer lasting heater lifeHigh temperature molded silicone end capsSpecial hard end caps for GE® applicationsManufactured to proper lengths, mountings and electrical OEM specificationsSeries wiring:NoNumber of tubes: 1Volts:115VWatts:550WOverall end-to-end: 21 15/16"Glass length (w/o end caps): 21 3/16"