Environmentally friendly, the Green Grinder efficiently grinds, hones, and polishes concrete. Designed for wet grinding, it can be fitted with a water tank. It features a quick-change diamond system to ensure even diamond wear and quick field changes. Propane fuels a 22-hp engine, certified to meet EPA and CARB requirements with an emissions shut down system and clean burning catalytic muffler enabling cordless operation. Green Umbrella Products. 870-917-2054. www.greenumbrellaproducts.com