Using the Request for Quote (RFQ) form provided on this page, you can request competitive procurement options on part number NS-3981 with rapid responses always offered by our staff. To ensure that you locate and procure exactly what you need with ease, we list parts with as much information as we can. For example, part number NS-3981 It is listed as Parts Kit Check Valve. component manufactured by National Oilwell, specifically under CAGE Code 11836. It is also accompanied by the NSN 4820011456249 for ease of organization, the first digits of the NSN indicating that the part belongs to FSC 4820 Valves Nonpowered.