Eterra OG15 Stump Grinder attachment, specifically a model produced around 2005. This legacy attachment is designed for use with mini-loaders like the Toro Dingo. M. Nolan FarmsKey SpecificationsCutting Wheel: 13-inch diameter.Hydraulic Requirements: Features a 2-line hydraulic system.Mounting: Uses a Dingo-style quick tach system.Control: Includes a switch box for operation. M. Nolan Farms Modern Comparison. While the OG15 was a common legacy model, Eterra's current equivalent for mini skid steers is the Vortex Mini, which typically requires a 12–20 GPM hydraulic flow range and a case drain for operation. Modern units feature upgraded radial piston motors and larger 20-inch wheels to handle tougher stumps more efficiently. Skid Steer Solutions + Used are selling for around 3K. Buyer must pick up. I can help you load it on your truck or trailer using my skid steer.