Distributor caps cover the distributor rotor and provide the connection point for spark plug wires. Contacts inside the cap then receive the high voltage spark from the rotor as it turns inside.
Due to the high voltage of the electricity present in an ignition system, distributor caps should be replaced at regular intervals - typically when doing a tune up.
Replacing a distributor cap should usually be a routine job, not requiring an intimate understanding of engines. There are many manuals available with step by step instructions, but if you're unsure, leave it to a professional!
We sell a large selection of quality distributor caps from these manufacturers: