MTM Hydro's Axial Vibration Dampeners are meant to be installed between your small engine and pressure washing frame to absorb vibration causing the entire machine to move. Replace your rubber Vibration Dampeners if you notice they are cracked or dry as this would indicate they are no longer effectively absorbing vibrations while in operation.
This Vibration Dampener has the following Specs:
Fixed position rubber body on 1/4" bolt (8mm)
3 1/4" in total length
1 1/2" length bolt on engine mounting side
3/4" length bolt on frame mounting side
Both sides have have a washer and locking nut