Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RL1393 4 found under Breather Assembly C by Lauson Division. The National Stock Number assigned to this part is 2805003579554, 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 RL1393 4.