Please fill out the form below for Clapper Assembly Va and get a quote for part number PK75 by National Oilwell with NSN 4820009274555 and FSC Name is 4820 Valves Nonpowered, please include required quantity along with expected turn around time. Our knowledgeable account manager will reply you shortly. Also check for the related parts for part number PK75. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.