Water Heater Rescue: Know-How, Solutions, Parts graphic

Products > Solid Combo Magnesium Anode Rod With 4-Inch Nipple

Picture of combo magnesium anode with 4-inch pipe nipple


  • a .90-inch-diameter (45 percent more than a standard factory anode) combo magnesium (also known as outlet) anode rod (about 48 inches of overhead clearance needed). This anode is 48 inches long. It has a 4-inch plastic-lined steel nipple, meant to be used in heaters with up to 2.5 inches of insulation.
  • pipe-thread seal tape
  • service sticker
  • instructions

This kind of anode screws into the hot-water port and can either replace another combo rod or augment a hex-head anode. Fits all residential water heaters with 3/4-inch plumbing. Heaters of 75 gallons and more often have larger plumbing and this anode won't work in them.

IMPORTANT! If you have an electric water heater made after April 2015 by A.O. Smith, Lochinvar, State, Kenmore, Reliance, American, Maytag or Whirlpool, you may need SKU106, which comes with a 6-inch pipe nipple.

Click here to learn how to read the label to know when a water heater was made.


  • The anode will keep your tank from rusting and breaking.
  • The tape will enable you to remove the anode in future to check it.
  • The sticker will help you remember when you installed it.


Pipe wrench. For further details, check out the Tools page.


The shopping cart generates an invoice and response, but we will give you delivery date and tracking information within a few days of your order by e-mail. We try to ship within one business day. If there is any hitch, we'll let you know immediately. If you hear nothing, consult your e-mail junk file. It's not uncommon for spam blockers to reroute our e-mails.


Merchandise in original condition can usually be returned within 120 days for a full refund of the purchase price, not including shipping. E-mail mail@waterheaterrescue.com for instructions and authorization.


The products offered here are designed to make water heaters last longer, or solve specific problems. Installation is potentially do-it-yourself, but if you have the least doubt about your abilities, we suggest that you obtain expert help.

Remember also that if you have difficulties with installation, odds are that a professional or handyman will know a way to do it.

Shipping is by UPS within the contiguous United States. UPS does not deliver to post boxes. Allow up to about a week for delivery. Canada, Hawaii and Alaska are only served by Priority Mail and can use a post box.


If you contemplate adding an anode to a new tank, it needs to be of the same metal. Otherwise, the magnesium rod will be consumed more rapidly in the presence of an aluminum one and you won't get as long a life. On the other hand, if the tank is five years old or more, having dissimilar metals is less of an issue, since the original one will likely be largely consumed.

All the lower-end heaters by A.O. Smith, American, State, Kenmore, Whirlpool and Maytag have aluminum anodes. We've thought about stocking aluminum combo rods, but we've preached against aluminum for 15 years and won't change now just to make a buck. You still have the option of removing the aluminum hex anode that comes with the tank and installing two magnesium anodes. A plus is that ours are thicker than factory ones.


Back to Product Index
Home | Site Map


Facebook icon Pinterest iconTwitter icon

La traducción español | Privacy Policy

La traduction française | Contact Us

News About Water Heaters | About Us

Resources | The Tank

©Copyright 1995-2018 by Water Heater Rescue
Water Heater Anodes• Smelly Water Heater Solutions