Surface Check fittings of the MS15000 series have spring-loaded ball check in the tip.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
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The MS15001-1 meets the most current revision, AS15001-1P, which is in the description. The 04-02325 meets the old MS15001-1, which has been superseded to AS15001-1P. New designs require the newest revision. The old spec can be used on experimental aircraft, or where the old spec would still apply.
Part # MS15001-1 is priced and sold individually. 1 fitting for quantity 1.