Please fill out the form below for Plug 375 18 Npt Sq Hd Dr and get a quote for part number STD453 by Lycoming Mfg Co, 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 STD453. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.