The rugged APT Clay and Trench Diggers are used for digging clay, shale, hard pan, and frozen ground. The Model 118 is most commonly used for clearing out dirt under existing foundations and for tunneling under existing structures. The Model 118 can be used for horizontal and for vertical work. The only difference among the APT Model 117 Paving Breaker and Models 118 and 119 is the handle. They have the same cylinders and the majority of internal parts in common. This makes them very versatile tools for use in various types of work. The 118 is now equipped with the patented Automatic Ball Valve. All APT Clay and Trench Diggers Feature: Automatic ball valve, Drop forged steel handle, Built-in automatic oiler, Replaceable chuck bushing, Inside trigger for better control and safety, Latch type retainer, Swivel hose connector, Four bolt back head and Nose reducing muffler available.