Hoover Adjustment Knob 

OEM # 38421099

This product is compatible with following Hoover models:


U6634-900 U6607-900 U6166-900 U6617-900 

U6626-900 U6618-900 

U6630-960 U6632-900 UH60000 UH60010 U6637-900

Thanks for looking!