Abstract: A liquid flow indicator includes means for indicating a flow of liquid therethrough, measuring the rate of flow of liquid therethrough, and selectively functioning as a one-way valve. The device includes a housing which is placed in a liquid flow conduit so that all liquid in the conduit flows through the housing whereby a float disposed in the housing is allowed to be displaced from a closed seated position wherein it selectively blocks the reverse flow of liquid through the housing to one of a plurality of open positions wherein it allows the forward flow of liquid through the housing. The amount of displacement of the float is discernible by calibrated indicia carried on the float and the housing so that not only the indication of a flow of liquid through the device is indicated, but also the rate of flow of that liquid.