Submersible pressure pump for liquid, at least having: 1.1. a pump housing with a housing outlet, with a first, large-area, housing inlet in the form of a suction strainer, and with a second, individual, housing inlet formed in the base of the pump housing, 1.2. a liquid pump which is arranged in the pump housing and which has an arrangement for liquid-level-dependent or pressure-controlled on/off-switching, and 1.3. a suction inlet into the liquid pump, wherein, 1.4. in a first intake situation, there is a fluidic connection between the suction inlet and the first housing inlet such that the liquid is sucked in through the large-area first housing inlet, wherein the second housing inlet is closed off, and, in a second intake situation, there is established a fluidic connection between the suction inlet and the second housing inlet such that the liquid is sucked in through the individual second housing inlet, wherein, 1.5. for changing from the first intake situation to the second intake situation, provision is made of an adaptor which is configured in such a way that the fluidic connection between the suction inlet and the first housing inlet is interrupted and, at the same time, the fluidic connection between the suction inlet and the second housing inlet is established, wherein 1.6. the arrangement for on/off-switching comprises a float switch, wherein the float switch, on the basis of its buoyancy in the liquid, detects a liquid level which is sufficient for operation of the submersible pressure pump, and the float switch is in the form of an external float switch which is connected to the pump housing by means of a connecting cable, characterized in that 1.7. the float switch has a central body which is shaped approximately in the form of a triangular prism, wherein the connecting cable is connected to the body at a triangle edge, 1.8. proceeding from the connection of the connecting cable, the spacing between the bases of the triangular prism increases, so that the buoyancy of the body increases with increasing distance from the connection of the connecting cable, and 1.9. a ring is formed around the central body of the float switch, which ring provides for better capability of sliding of the float switch over an underlying surface and also for improved buoyancy. 1.1. a pump housing with a housing outlet, with a first, large-area, housing inlet in the form of a suction strainer, and with a second, individual, housing inlet formed in the base of the pump housing, 1.2. a liquid pump which is arranged in the pump housing and which has an arrangement for liquid-level-dependent or pressure-controlled on/off-switching, and 1.3. a suction inlet into the liquid pump, wherein, 1.4. in a first intake situation, there is a fluidic connection between the suction inlet and the first housing inlet such that the liquid is sucked in through the large-area first housing inlet, wherein the second housing inlet is closed off, and, in a second intake situation, there is established a fluidic connection between the suction inlet and the second housing inlet such that the liquid is sucked in through the individual second housing inlet, wherein, 1.5. for changing from the first intake situation to the second intake situation, provision is made of an adaptor which is configured in such a way that the fluidic connection between the suction inlet and the first housing inlet is interrupted and, at the same time, the fluidic connection between the suction inlet and the second housing inlet is established, wherein 1.6. the arrangement for on/off-switching comprises a float switch, wherein the float switch, on the basis of its buoyancy in the liquid, detects a liquid level which is sufficient for operation of the submersible pressure pump, and the float switch is in the form of an external float switch which is connected to the pump housing by means of a connecting cable, characterized in that 1.7. the float switch has a central body which is shaped approximately in the form of a triangular prism, wherein the connecting cable is connected to the body at a triangle edge, 1.8. proceeding from the connection of the connecting cable, the spacing between the bases of the triangular prism increases, so that the buoyancy of the body increases with increasing distance from the connection of the connecting cable, and 1.9. a ring is formed around the central body of the float switch, which ring provides for better capability of sliding of the float switch over an underlying surface and also for improved buoyancy.