The MG Duff brass base plug is designed to house a universal zinc pencil anode inside the engine cooling circuit to help protect the dissimilar metals of heat exchangers, coolers and casings from electrolytic corrosion. This brass plug has a thread size of 3/8" NPT male with a 3/8" female socket.

Material	Brass
Type	Pencil Anode Plugs
Brand	MG Duff
Primary Construction	Brass
Style	Anode Plugs
Suitable For	Universal
Thread Connection	NPT
Thread Fitting Size	3/8"
Thread Size	3/8" NPT Male & 3/8" UNC Female