Welcome. (45 years in Point Boro before heading south) As for the plug. It most likely is the sacrificial anode that protects the tank from corrosion. It's hard to tell how bad the anode is without a picture but they are cheap so you might just want to replace with a new one. I assume you got it from CW on Rt 9, they have them in the store or you can get them online cheaper.
Welcome to the family and travel safely, Hank
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Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD .. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite
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