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This glow pin seal is used on all Hydronic 10 models. It does not fit the earlier D9W

This glow plug screen is modified to help reduce carbon build up. It should be changed when you change the glow plug

This gasket is used to seal the combustion blower motor to the heat exchanger and is used on the following heaters: B4 - 20.1812.05, D4(Series) - 25.2113.05, 25.2114.05, 25.2144.05 & 25.2327.05. This seal must be changed whenever the blower motor is separated from the heat exchanger.