5 Pack Engine Zinc Anode ~ With Unit5 Pack Engine Pencil Zinc Anode ~ Brass Plug ~ Heavy Duty. Message us with any questions you might have, or you can send us a picture of your part and we will make sure you are buying the correct zinc size. Factory Direct, Heavy Duty Zinc Anode. Here at Lenco we manufacture everything we sell. Cut out the middleman and deal direct. We have been servicing the marine industry since 1972. Supplying engine manufacturers, world class marinas, and backyard