37
GB
5.2 CLEANING THE NON-RETURN VALVE
`
drain, which can be inspected, in order to prevent
>#
Proceed as follows to clean:
-Open the inspection cap using pliers (Fig. 27).
-Remove any dirt that has been deposited.
-Close it again, tightening the cap suitably and
making sure not to damage the gasket.
Fig.27
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