Water Heater Temperature & Pressure Reducing Valve - Trident Plumbing
Water Heater Expansion Tank Information
What a Well Tank Does - Flexcon
Do I need an Expansion Tank? Why is my Water Heater T&P (Temperature & Pressure) Valve dripping?
Thermal Expansion Tanks: Part 1 - The Need - Roger W. Griffith, P.E.
This device takes does the same job, but takes up 90% less space. Why you should opt for a thermal expansion valve over a traditional expansion tank - Mifab