Pro Quip Fast Pour Plastic Fuel Cans are designed with both a main cap and a separate breather cap. Having a separate breather is essential for allowing enough air to replace the fuel flowing out from the can without causing any glug or interruption. Our design places the breather hole at the back shoulder of the can allowing it to remain unobstructed while tipping. Before pouring, give the breather cap a half turn for restricted flow, or fully open it when emptying the full contents of the Can. Combining the breather with a full diameter pouring nozzle tip means one of our 20L cans can be emptied from full in less than 60 seconds, reducing the amount of time holding a heavy can.