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Installing an inline back draugt shutter between ventilation ducts prevents backflow of ventilation air. Tidal Locations - Turbulence of flow due to severe wave action will shorten the working life of a flap valve.If the item comes direct from a manufacturer, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag.

Therefore it is recommended that careful consideration is given to the positioning of valves and they are installed within an outfall bay or otherwise protected from direct wave action by baffles. The unique, patented valves push into the inlets on the inside of inspection chambers or manholes and are compatible with both plastic and clay pipes. Additional EPDM sealing material can be compressed through sealing lines - giving special advantage for sewer pipes with rough surfaces e. As well as the options provided below, you can choose to restrict or block cookies through your browser settings at any time. The force of the flow in the correct direction allows the valve to open whilst back flow forces the valve plates to close.

Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item.