The 502010-0005 Polyimide Insulator Heater Jacket Kit is designed for 1.0 inch diameter vacuum tubing straight sections that are 1.0 inch long. The kit comes with 5 individual 1 inch long insulators. Series 49UL insulators keep heat from escaping for better temperature uniformity in vacuum piping applications. Polyimide constructed heater jackets can be used in all critical applications where minimal outgassing, ultra-low particle generation, elevated temperatures up to 200°C, and ease of installation are required. These patented heaters are constructed with fully squared ends and a form fit shape to maximize thermal efficiency and temperature uniformity, minimizing thermal losses and power consumption.