Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HCS2055-04 found under Vacuum Pump Electri by Heatcon Composite Systems Inc. The National Stock Number assigned to this part is 4130014716444, and the Federal Supply Class is 4130 Refrigeration And Air Conditioning Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HCS2055-04.