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Eberspacher D4W or D5W Glow Pin Liner & O-ring seals Genuine Eberspacher product Eberspacher D4W Hydronic, B4W Hydronic & D5W Hydronic heaters Applicable model list in description below. Kit contains glow pin liner and seals. Technical support and additional products available from ButlerTechnik Suitable for Eberspacher Water Heaters including; D5WSC 12V HYDRONIC HEATERD4WSC 12V HYDRONIC HEATERD5WS HYDRONIC 12V HEATERD5WS HYDRONIC 24V HEATERB4WSC HYDRONICD5WZ HYDRONIC HEATER