This replacement part is used on the base of various models of pressure washers to reduce vibration from the pump. This Grommet has an O.D. of 1 inch, is not part of a kit or assembly, is sold individually, and is made of durable black rubber. This part is known to wear with regular use of your machine, it should be replaced if you noticed more vibrations than normal within the unit. Customers rate this repair as Easy.