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