Please fill out the form below for Mask Repl By Mbu 5 Or P Or 12 Or P and get a quote for part number 520-402 by Avox Systems Inc, 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 520-402. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.