| http://www.w3.org/ns/prov#value | - The selector valve handle 14 is operable to allow the operator to selectably open and close the flow of the pressurized liquid from the pump 11 to the soil penetrating lance 10 or, alternatively, to selectively open and close the flow of a compressed gas such as air, ozone, nitrogen or oxygen from source 116 through tube 112.
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