Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2131-5197 found under Indicator Low Pressure Air Brake by Harsco Corporation. The National Stock Number assigned to this part is 2530003996407, and the Federal Supply Class is 2530 Vehicular Brake Steering Axle Wheel And Track Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2131-5197.