The NGK range of Resistor Covers are designed to give perfect noise suppression across all frequencies whilst engine performance is not adversely affected whatsoever.

Featuring a resistor element pressed in between the plug terminal and the high tension wire connection, the construction is extremely durable, the resistor element is long enough to prevent interior flashover, and steady resistance is maintained. Superlative ceramic materials are incorporated that resist deterioration and have small resistance variation under over-load, whilst the plug connector is made of sturdy phenolic resin, and very rugged rubber material. The heat press insertion makes the construction very strong and vibration-resistant. Special rubber seals on both ends prevent moisture from causing electrical leakage.