Catalog > Electro-Mechanical Components > Fasteners Hardware > Electronic Hardware > Heatsink Insulators and Bushes Silicone Rubber Heatsink Insulator Silicone Rubber Heatsink Insulator TO3 MICA SIL/BUSH ** Discontinued ** SILICONE RUBBER THERMAL INSULATOR+ BUSH Discontinued Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Features for TO3 with Bush