Manufactured by NUMA, the Champion RC210 features a valveless down hole reverse circulation hammer design. This hammer, which ejects cuttings through the collection tube, has the ability to drill against high heads of water and can operate at pressures to 200 psi. It is environmentally sensitive, as well, since no foam is required for hole cleaning and lubricants are not free to contaminate the formation. Typical vertical and horizontal applications include caissons, piles/rock sockets, tunneling under roads and other jobs where large volume rock excavation is required. NUMA, Card No. 275