What do the numbers on a tire mean? The DOT number appears on the sidewall of all tires intended for sales in the U.S., and designates the location of manufacture, the week and year of production, and the specific tire.
Water heater anode rod or sacrificial anode is the important component part with only one purpose; to protect metal tank from corrosion. Use this article to learn how to replace the anode, installation tips, how it works, about different types and when to use each one.
You can also make your old water heater last longer (sometimes 20-30 years) by replacing the anode every 3-5 years, if you have room to pull the old one out and install a new one. The anode corrodes instead of the steel tank, and when it's gone, the tank goes.