Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WPP139 found under Spark Plug by Siemens Water Technologies Corp. The National Stock Number assigned to this part is 2920001448093, and the Federal Supply Class is 2920 Engine Electrical System Components Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like WPP139.