Genuine Eureka Style W Vacuum Cleaner Belt. Made of extremely strong reinforced mylar. The markings on this belt are 12.8 x 429. It replaces 12.8 x 430. It also fits all models using Electrolux B1 belt. 

This belt is made by Filtrete, it is a genuine OEM Eureka style W belt, part number 67037A. Also known as part number 86389, 67037, 67037D

Fits AS5210A, S5210A, AS3101A, AS8400A, AS5210A, AS1060, AS3000, AS3011, AS3020, AS3030, AS3033, AS3100, AS3101A, AS3300, AS3400, AS5210, and AS8400A models:

AS3008A Eureka Air Speed Exact Reach
Eureka AS3011A Air Speed Exact
Electrolux EL8400A Amplify Bagless Upright
Eureka AS5210A Air Speed Zuum
Eureka AS3104A / AS3104AX Airspeed SuctionSeal 2.0 Pet
Eureka AS1092A AirSpeed
Eureka AS3101A Airspeed SuctionSeal 2.0 Rewind
Eureka AS1061A AirSpeed
Eureka AS3030A Airspeed Unlimited Rewind

NOTICE: Before replacing your old belt with a new belt inspect your old belt. Did it break or did it melt? If it melted you will likely see the reinforcing strands and would have noticed a burned rubber smell. I've never seen one of these belts break but I've seen many that melted.

Try to determine what restricted the brush or belt from turning freely or whatever caused it will likely do the same thing to the new belt after being installed. Sometimes a bearing somewhere is going bad and may run for a while then get hot and / or seize up.