Trenching Guide | hand tools, shovels, + power trenchers
Trench Clean-Out Shovel | Remove loose soil from a trench.
Trench Digger - Lee Valley Tools
Amazon.com : GeoRipper MiniTrencher GR620, Handheld and Lightweight Mini Trencher That Offers Portability and Fast Digging Capabilities for Landscaping and Irrigation Applications : Patio, Lawn & Garden