The lack of a flow tube and the durable metal body prevent the breakage problems long associated with standard flowmeters. The compact size allows the Precision Medical Flow Selector Valve to fit into tight headwall areas and makes it virtually damage proof when other equipment is installed. Accuracy is assured at every flow setting without the need for a visible float as in Thorpe tube flowmeters. The knurled flow adjustment knob and the large easy to read numbers make flow adjustments easy.