... box, thermostat, Switch, Anode magnesium bar, T/P valve, Relief valve Working Pressure 6.0 bar Hail Resistance Φ25mm Balcony solar ... system composes of intelligent controller, circulating pump, flow meter, relief valve, pressure gauge, expansion vessel, check valve2) More intelligent operation ... and copper coil from water scale effectively3) T/P valve, Stainless bolts & nuts, anti-aging rubber seal, ...