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Eberspacher Glow pin 12v suitable for Hydronic 10 or D9W water heater Marked as 8v on actual glow pin Suitable for the following Eberspacher water heaters251996050000 Water Heater D9W 12v252160050000 Water Heater D10W 12v252081050000 Water Heater D10 12v 251815050000 Water Heater D9W 12 V