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You have until Feb 1, 2017 to return or exchange items purchased between Nov 1, 2016 and Jan 1, 2017. All other standard return policy conditions apply.
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The Schneider Series 9 Retaining Ring is used to secure a drop-in filter inside a filter holder. The specific filter is sandwiched between the holder and retaining ring. A hood can then be used with the retaining ring.