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Navasota Oilfield Services, Inc. (NOSI) was founded in 2008 to manufacture, repair and service wellhead equipment. Wellhead & Valves Christmas Trees Choke Manifolds 1502 Chokes, Tee’s. NOSI is an authorized distributer of IEI Ram and Annular BOPs. NOSI has a fully tooled and staffed Machine Shop, Assembly Shop, Hydrostatic Test Facility, Paint Booth. all is prepared to exceed our customer’s expectations!