This EZ-POUR push in vent cap is what you need to easily block and unblock your flow hole. This cap will fit most 0.5 inch holes and most older Blitz and Midwest cans, along with many other cans. Alternatively, you can add a flow hole to your can by drilling a half inch hole into your can! Having an open flow hole will increase the speed and consistency of a your pour. No more splashing gasoline on your garage floor while trying to fill the snowblower, no more waiting while it takes forever to fill your jet ski. With this push in vent you'll have no problem increasing the speed and ease of the pour.