Quick view Bergquist Thermal Insulator - TO-247 Bergquist Thermal Insulator Fits TO-220 and TO-247 components. This is a replacement thermal pad for our SSTC 1.0, SSTC 2.0, Flyback 2.0, and Class-E Audio Modulator kits. MSRP: Was: Now: $1.50 Add to Cart