Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S237-2-1222 found under Tester Air Brake by Sealco Air Controls Inc. The National Stock Number assigned to this part is 4940015159929, 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 S237-2-1222.