Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 239 70 148 found under O Ring by Oerlikon Leybold Vacuum Usa Inc. The National Stock Number assigned to this part is 5331013161318, 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 239 70 148.