Vinyl Tubing - Blue. 1/2 in
Vinyl Tubing - Blue. 1/2 in at HorticultureSource.com -
1/2" ID Blue Vinyl Tubing. Priced Per Foot. May be used to monitor nutrient levels by attaching to the outside of a reservoir via 1/2-inch grommet and 1/2-elbow. When the nutrient levels rise or fall you will be able to see it.