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685PRESSURE CONTROLAERATORS, PRESSURE COMPENSATION FOR SMALL ENCLOSURESAERATORS, PRESSURE COMPENSATION FOR LARGER ENCLOSURESDATA SUBJECT TO CHANGE WITHOUT NOTICE.The 880 PR1 aerator, pressure compensation device allows change in enclosure pressure. This aerator is made of PA66 Nylon and is used on small enclosures. For better performance, the aerators must be installed on opposing sides, one or more on the top and one or more on the bottom portion of the enclosure.The 880 PR2 aerator, pressure compensation device allows change in enclosure pressure. This aerator is made of PA66 Nylon and is used on larger enclosures. For better performance, the aerators must be installed on opposing sides, one or more on the top and one or more on the bottom portion of the enclosure.CATALOG NUMBERSHIP WGHT LBS.880 PR1 1 1PACKSCATALOG NUMBERSHIP WGHT LBS.880 PR2 1 1PACKSScreenM1529mm %u00d8 10,50mm15mm12mm15mm23mm%u00d8 31mmGasket%u00d8 54mm75mm15mm22mm 18mm 50mm%u00d8 54mm