A tap cartridge 100 has a self-closing part 110 and a thermostatic mixing part 120. The self-closing part110 has a first chamber 111 having a tap cartridge outlet 113, a second chamber 112, a valve body 114 between the chambers, means 115, 116 for causing movement of the valve body 114 to selectively open the cartridge outlet 113, and means 117, 118 for causing movement of the valve body 114 to automatically close the cartridge outlet 113. The mixing part 120 comprises a heat sensitive element 121 to change shape in response to the temperature of water, and hot 123 and cold 124 water inlets. The heat sensitive element 121 regulates the relative amounts of water entering the mixing part 120 from the hot and cold water inlets 123, 214 by changing shape Mixed hot and cold water exiting the mixing part 120 enters the first chamber 111 and exits the cartridge 100 via the cartridge outlet 113 when open.
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