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Links are elements which connect two nodes. A link can be a pipe, with or without a check valve, a pump, or a valve. The valve types accommodated by Wadiso are pressure reducing valves, pressure sustaining valves, pressure breaker valves, throttle control valves, flow control valves, and general purpose valves. A link is defined by its link number and the numbers of the two nodes it connects. Links do not need to be numbered consecutively. Note that pumps and valves are not treated as additions to pipes. They are stand-alone links.