... box, thermostat, Switch, Anode magnesium bar, T/P valve, Relief valve, dustproof ring Working Pressure ≥ 6 bar Hail Resistance ... intelligent controller, circulating pump, flow meter, relief valve, pressure gauge, expansion vessel, check valve, etc. 2) More intelligent system operation, ... tank and copper coil from water scale effectively3) T/P valve, Stainless bolts & nuts, anti-aging rubber seal, ...