Generic Flow Thru Element [4.0 kW, 10", 230V, Titanium] (47 555 2525) pentairpacfab this hydrostatic relief valve helps this hydrostatic relief valve helps support pressure protection and more dependable system performance A correctly matched topside like this should restore the original convenience and confidence of the spa rather than creating a learning curve around a less suitable replacement this generic titanium flow thru element is a practical replacement when the original 10 inch 4 A heater element like this is useful because it restores the active heating component within systems that rely on a flow thru design rather than a flange mounted assembly