Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PL-52601 PIECE 55 found under O Ring by Haskel Europe Ltd. The National Stock Number assigned to this part is 5331012315208, 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 PL-52601 PIECE 55.