Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PB50003-SHEET-1 found under by Porobond Products Llc. The National Stock Number assigned to this part is 2930013681071, and the Federal Supply Class is 2930 Engine Cooling System Components Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PB50003-SHEET-1.