Please fill out the form below for Ring Retaining External and get a quote for part number MS3215-4018 by Bombardier Aerospace, 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 MS3215-4018. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.