Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PEN-AIR-M-5572B-READY-TO-USE-PU found under by Penetone Corporation. The National Stock Number assigned to this part is 7930013146133, 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 PEN-AIR-M-5572B-READY-TO-USE-PU.