What is full?

[Tpdingo]

The predator 212 tank seems to be "empty" when it is at 1/4 full but the little filter in it says that like 2/3 full is "full". Can you top it off or only up to the red mark on the filter.

 

[Kansaskart]

Never noticed a red Mark unless you are talking about the float. I fill mine to the bottom of the cap neck with no problems. If it leaks either get another cap or put less in. I think the float is useless. I just fill mine up before use and know where I can go with that or if I need to take a can with me.