Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 88-574 found under Valve Check by C And H Distributors. The National Stock Number assigned to this part is 4820012258254, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 88-574.