Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20-037 found under Piston Compressor by Spectrum Pressurestat Co Inc. The National Stock Number assigned to this part is 4310012077467, and the Federal Supply Class is 4310 Compressors And Vacuum Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 20-037.