SharkBite Brass 3/4-in Push-to-connect Thermal Expansion Relief Valve in the Pressure Relief Valves & Regulators department at Lowes.com
Relief Valve Leaks due to Thermal Expansion of Hot Water: cause & cure
IAPMO
The NFPA 13, UL, FM and Manufacturer Requirements for Pressure Relief Valves Downstream of Installed Pressure Reducing Valves
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
SharkBite 3/4 in. Brass Thermal Expansion Relief Valve 25704LF - The Home Depot