Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20B 33401 H3 found under Valve Poppet Engine by Robin America Inc. The National Stock Number assigned to this part is 2805016287144, and the Federal Supply Class is 2805 Gasoline Reciprocating Engines Except Aircraft And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 20B 33401 H3.