Water Source™ DC125 Cast Iron Drive Cap, 1-1/4"The 1 1 4 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. 1 1 4" 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