Here is the larger version of the in line flow indicator in the wagon wheel style that I really like to have on my tubing to show how fast the liquid is flowing through the tube.

This larger version is made to fit from 5/16" hose up to and including 7/16" I.D. and the double barbs on this indicator are more like the barbs found on our normal connectors with two of the same size on each end. It slides right into our soft silicone tubing and has a very secure fit.

The outside diameter of this large indicator is approximately 1 3/8" and it is 1/2" thick.