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
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SharkBite 3/4 in. Brass Thermal Expansion Relief Valve 25704LF - The Home Depot
Amazon.com: Midline Valve 3349 Expansion Tank Isolator Relief Valve, with Drain, with T-handle, 1/2 in. FIP x MIP, Brass : Everything Else
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SharkBite 3/4 in. Brass Thermal Expansion Relief Valve 25704LF - The Home Depot
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Thermal expansion tank requirements for Water Heaters in KC.