Good news! The part number 521839 is available with us in our ready-to-ship inventory. This part is a Plug Breather, manufactured by Raytheon Company (CAGE Code 37695) having NSN 4730016673995 and FSC 4730 Hose Pipe Tube Lubrication and Railing Fittings. If you want to purchase this part, we can provide a quick quote for this part number after you fill out the RFQ form on this page.
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