Please fill out the form below for Valve Butterfly and get a quote for part number 4R2040-43A1A by Norriseal with NSN 4820009290776 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 4R2040-43A1A. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.