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Web100mm In-line Extractor Fan Vent Back Draught Shutter With One Spring And Two Flaps : Amazon.co.uk: DIY & Tools Building Supplies › Heating & Cooling › Ducting £799 FREE Returns FREE delivery Wednesday, April 5 on your first eligible order to UK or Ireland. … Web28 Oct 2024 · This assembly contains two spring-loaded check valves with a differential relief valve between them and two shut off valves and four test cocks. The RPZA operates like a DCVA with the addition of a relief valve, if there is a backflow the check valves will close, and the relief valve will open, resulting in a reduced pressure zone and air gap … WebThis automatic air vents opens to air and gases but shuts against steam. It discharges air at full bore on start-up and opens during running whenever air collects, irrespective of the … the wild isles