| 摘要 |
A gun housing including a barrel having a cylindrical opening extending through the barrel. Replaceable parts are located within the barrel for receiving sand in one end of one of the parts and for directing it to the other parts for flow through the gun. A water jacket part is provided in the barrel and a water inlet opening and a water connection are incorporated in the housing for introducing water into the chamber where the sand and water are mixed for flow of the wet sand from the outlet end of the gun.
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