Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 0520 found under Diaphragm Pressure Switch by Puritan Bennett Corp Of California. The National Stock Number assigned to this part is 5930012615909, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 0520.