This open well casing clamp is designed for temporary rapid-deployment installations in any "open-well." It simply hangs over the edge of any open casing and cinches in place with a few twists of the locking tee handle. The uppermost part consists of a nylon gripper that will secure the EarthStraw for pumping. The heavy-duty clamping devise of these hand pump well parts is constructed from welded steel and molded nylon with rubber grippers. If you are using this system it is a good idea to also purchase an EarthStraw Pump Cover to protect the system and keep debris from falling into the well.