Layshaft clutch pto f, prop shaft driven. This pto can be operated when the vehicle is moving. To operate just apply air this then engages the clutch plates which powers the system. The advantages in using this method are immense, there is no need to dip the clutch to engage which eliminates damage to gears crashing in and out . This unit is generally used on gulley suckers but is also used on other applications. There is also a pump drive version in this model. This model of pto is unique to Webster Drives.