Please fill out the form below for Nipple 250 Anpt To 31 Tube and get a quote for part number AN816-5-4 by Engine Components 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 AN816-5-4. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.