Zinc Anode 7/8" Corrosion Grenade # AC Zincs ACZ-7/8

So far so good. I’ve heard a lot about these grenades, so I had to try it.

Product was what I thought I was purchasing.

Excellent all around!

Doesn’t fit. Trying to return it. No one responding. Stuck with this. Sorry we ordered.

Zinc protects other metals from electrolysis. I knew about this when I owned boats. We would protect our expensive metal parts that live underwater from the menace of electrolytic corrosion by attaching zinc pieces to them. Zinc is the least noble metal, and will be the sacrificial recipient of corrosion when dissimilar metals are immersed in water and form a weak battery that creates stray electrical currents. So the aluminum and bronze propellers, outdrives, etc. don't get eaten up. This grenade, which is just like the zincs we put on the propeller shafts of inboard-powered boats, will likewise protect the expensive aluminum coils and fins on your HVAC system, which is particularly important if the unit is outside in the humidity. Just be sure when installing this to sand the surface of the copper pipe where you're mounting this to leave it bright and shiny for a good clean connection. The grenade separates into two halves, joined by two bolts, for an easy installation.