UNO type II safety can has an exclusive ergo-progressive design that features a Safe-Squeeze trigger mechanism that releases liquid with precise timing controlling the liquid flow when you're ready.The UNO's handle and trigger are designed for a natural grasp. The weight of the can rests firmly in the strongest part of the hand, the palm, while a simple finger squeeze on the trigger opens the piston-actuated spout and vacuum release valve for accurate, glug-free pouring. Half-inch raised bottom offers secure grip lip during pouring. A release of the handle instantly closes the valve to guard against dangerous, surprise "spill-overs." For single-handed filling, simply engage the lift latch with your finger and push down on the trigger to open the fill spout.