Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12H23970 4 found under Insulation Pipe Cov by Hitco Carbon Composites Inc. The National Stock Number assigned to this part is 1660014877696, and the Federal Supply Class is 1660 Aircraft Air Conditioning Heating And Pressurizing Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 12H23970 4.