Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PH555-2 found under Pitot Tube by Aero Industries Inc. The National Stock Number assigned to this part is 6610006268523, and the Federal Supply Class is 6610 Flight Instruments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PH555-2.