James, Is right about cheaper wires ( Pepboys, Autozone some local parts houses) don't have the same seal around the top or the groves, but the fact is wires do leak and condensation sets in. I bought 11004 wires mine from DMC Houston 3 years ago and depending on how much it sits out, water and condensation gets in. I have used Bosch and Volvo much to the same demise. Wires are not hermatically sealed and will come loose and leak. If there had been a better designed not to retain water in the holes if it got in then there would be no reason for a sealed wire in any brand. John Hervey