Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21058 found under Condenser Refrigeration by Barnstead Thermolyne Corporation. The National Stock Number assigned to this part is 4130002566462, 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 21058.