If the WARTHOG ® WV-1/4 ™ is being used in pipes larger than 4” in diameter, a rigid stinger should be installed between the tool inlet and the hose end. Otherwise the tool can turn around inside the line (as shown at left) and come back toward the operator, causing serious injury or death. An example of proper stinger use is shown in the photo at right, where a WV-1/4 ™ is preparing to enter a line.