Yellow slide highlights four separate windows and locks into position. The Gas Can Tag reminds you if the gas inside the can is raw gas or mixed.
The PAW International Gas Can Tag. A convenient, practical, and safe way to keep track of the mixed fuels for all your 2‑stroke power tools. Attaches to the handle of a one gallon gas can. Cans not included.
When you mix your gas simply slide the indicator to the appropriate mixture. The four windows indicate: RAW GAS as well as the three universal mixes: 50:1, 40:1, and 32:1.