Are you looking for part number 50290, 50481, 50489, 50550, 50556 of Pentair Water Treatment? We can help you! Simply complete the Request for Quote (RFQ) form given below to get started. The National Stock Number (NSN) is a 13-digit serial number assigned by the US Defense Logistics Agency (DLA) to items that are procured, stocked, and issued through the federal supply system. Use our optimized search engine to find your required NSN such as 5305014412534, 4610014426858, 5935014426857, 5330013301498, 4610014426847 and parts Screw: Machine, Locking Segment Kit, Plug Assembly,Tip, Retainer Packing, Permeate Port. Then submit an instant RFQ for a quick, competitive quote.