Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HO1-4-60-C-INTERNALS-SP found under Parts Kit Flow Rate Meter by Hoffer Flow Controls Inc. The National Stock Number assigned to this part is 6680015090220, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HO1-4-60-C-INTERNALS-SP.