From Amazon
Bosch Wash Brush (Compatible with: EasyAquatak 110/120, UniversalAquatak 125/130/135, AdvancedAquatak 140/150/160, AQT 33-10, AQT 33-11, AQT 35-12 ,AQT 37-13, AQT 40-13, AQT 42-13, AQT 45-14 X)
Powertool World
Bosch Green Wash Brush for Aquatak Pressure Washers F016800359
This product is also available at 1 unverified merchant.