Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VL 5 CHAP.A1-49-20 ITEM 428 found under O Ring by Rolls Royce Marine North America. The National Stock Number assigned to this part is 5331016066299, 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 VL 5 CHAP.A1-49-20 ITEM 428.