Rule Slimline Submersible Pumps and Pump Kits Rule slimline submerisble pumps are suitable for use with diesel, fresh water, and salt water. The pumps, available in 12V or 24V versions, may be used to transfer diesel with no spillage. Rule slimline pumps may also be used for marine equipment washdown applications, or simply to transfer water between one area and another. The submersible pumps are suitable for intermittent, light duty applications.