Please fill out the form below for Ring 1 12 Id O W Exit Door and get a quote for part number 40172-18-6 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 40172-18-6. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.