"<b>If the new valve leaks, add an expansion tank</b></br> <p>If a new TPR valve didn't solve the  problem, solder in a ""tee"" and a female-threaded fitting on a horizontal cold  water line near the water heater. Then wrap the tank threads with Teflon tape  and screw in the tank. </p> <p><strong>NOTE: </strong>Toss the  saddle tee that comes with the expansion tank and install a tee and threaded  fitting instead. Saddle tees always leak over time.</p>"