Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P-W-158E WAX GEN. PURP. SOLVEN found under Wax General Purpose Solvent Type by Federal Specifications. The National Stock Number assigned to this part is 7930002981945, 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 P-W-158E WAX GEN. PURP. SOLVEN.