Water Source™ DC200 Cast Iron Drive Cap, 2"The 2 inch drive cap protects points and drive pipe threads while driving a well point into the ground. A small vent hole in the top of the casting relieves pressure during driving operations and can be used as a guide for a driving tool. The drive cap is constructed of cast iron. 2" Extra strength special alloy cap provides proper driving of well points Cast iron construction Protects points and drive pipe threads while driving a well point into the