Apollo 3/4 in. LF Brass Full Port Solder Ball Valve with Integral Thermal Expansion Relief Valve 1/2 in. NPT/Solder Outlet 78RV227125 - The Home Depot
SharkBite Brass 3/4-in Push-to-connect Thermal Expansion Relief Valve in the Pressure Relief Valves & Regulators department at Lowes.com
How to Install a Water Heater Expansion Tank
Locating an Expansion Tank - Fine Homebuilding
Water Heater Expansion Tank Information
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
Apollo 78RV115100 | Thermal Expansion Valve, 3/4 Inch NPT, 100 Psi | Raptor Supplies Worldwide