Did you ever notice that there is a third nut in the top of your water heater? Do you know what that is and what it's purpose is? I do. (Cre8tor: don't answer this.)
Copyright © 2017 HubPages Inc. and respective owners.
Other product and company names shown may be trademarks of their respective owners.
HubPages® is a registered Service Mark of HubPages, Inc.
HubPages and Hubbers (authors) may earn revenue on this page based on affiliate relationships and advertisements with partners including Amazon, Google, and others.