Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HCS2055-S1 found under Vacuum Pump Electri by Heatcon Composite Systems Inc. The National Stock Number assigned to this part is 4310016017997, 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 HCS2055-S1.