Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 52-548-018 found under Gage Cylinder by Fred V Fowler Company Inc. The National Stock Number assigned to this part is 5210001816567, and the Federal Supply Class is 5210 Measuring Tools Craftsmens. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 52-548-018.