you will have a filling loop flexible hose somewhere, remove the cap and place it between the valves as shown, open both valves till pressure is between 1.0 Bar and 1.5 Bar, then close both valves and remove the hose again and refit the blanking cap
you will have a filling loop flexible hose somewhere, remove the cap and place it between the valves as shown, open both valves till pressure is between 1.0 Bar and 1.5 Bar, then close both valves and remove the hose again and refit the blanking cap