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Eberspacher Glow Plug for 24v D9W Hydronic 10 Heater Rated voltage 18 V Current 5.3 A Thread M10x1 Overall length 68mm Suitable for the following Eberspacher water heaters; 251997050000 Water Heater D9W 24v 252044050000 Water Heater D10W 24v 252161050000 Water Heater D10W 24v 251816050000 Water Heater D9W 24v