A device is provided for increasing fluid pressure, the device having a first conduit having a fluid inlet and outlet, the first conduit provided with a non-return valve and a second, bypass, conduit having bypass inlet and by pass outlet connected to the first conduit either side of the non-return valve, which bypass is provided with a pumping means. The pump may be sized such that the device can deliver a high pressure of fluid to a low flow-rate demand outlet downstream thereof whilst the device allow a high flow-rate demand downstream of the device to be supplied at low pressure as and when required resulting in a much cheaper, more efficient and more durable pumping arrangement, useable in several applications.
