Be sure to test your new can using water before committing by filling with gas. I'll tell you why in a moment. But first I want to mention that after the testing is complete, remove the cap, empty all the water,and leave the can OPEN with the can upside down and tilted a bit with the opening resting on the ground so all water can drip out and air can get inside the can. Be sure the can dries out in a DRY location (did I really need to say that?) for several days to make sure it is completely dry before filling with gas.Why test before using? Because the reports of leaks are TRUE. However, you must tighten the cap to where you feel it begin to seat and then continue to tighten until the securing teeth on the cap engage the notch on the can (photo #2), and folks, this requires more force than I personally believe should be necessary to secure the lid to a leak proof state. If you feel as though you are tightening too much, "welcome the club, my friend".One of the reasons for this is that the mouth of the opening (photo #1) is slightly distorted presumably from the manufacturing process. The brown o-ring inside the cap (shown in photo #1) must seal very tightly against the mouth of the opening to prevent the gas from getting past the o-ring so again... the cap teeth MUST engage the notch on the can, one notch at a minimum). Make sure there is an o-ring as one video post I saw where the can was leaking horribly acted just like there was no o-ring... it happens.Before you tighten down the cap, be sure the dispensing nozzle is pointed in the right direction because it won't move once you tighten it down securely and it shouldn't be forced.Now that you are set up for testing (you did fill it with water and dry off the outside so you can check for any leaks, right?), try tipping the can by 90 degrees for several seconds (in a sink, tub or outside) as if you were going to dispense but DO NOT dispense anything at this time. Tip back and forth several times letting it sit at 90 degrees for several seconds between tips. Now let it rest upright so any liquid that makes it past the o-ring has a chance to make its way down the threads under the cap and drip down the side of the can. Repeat until you are confident that the can does not leak and you have identified how many cap teeth you have to use on the notch to establish a good seal.Did it leak? If so, try tightening down the lid by another notch and try again.Once you have established a solid seal, try dispensing the water. If you want to have some fun while you are testing, take the can (the one with water in it!!!) out onto your front lawn and start watering your flower bed when the neighbors are watching.Last step... imagine your can is empty and you are now at the gas station getting ready to fill it back up. Try taking the lid off. Was it next to impossible? If so try loosening then tightening and repeat the leak test until you feel you can remove and reinstall the lid without having to use unreasonable force. Lets face it... for some of us, mowing the lawn is the furthest thing from a "hobby" so fighting with a leaky gas can with a lid that is very difficult to remove is not going to make our day any brighter. Save yourself a lot of frustration, time, and spilled gas by performing these simple tests BEFORE you use it with gas to make sure you understand the limits and reliability of the mechanism.One other point, there is no handle on the side of the can and it is VERY difficult to tip to 90 degrees using only the top handle. The tip I was given was use both hands to lift, tip to 90 degrees, and position the can in the filling position. Next use your legs/knees to hold the can and then you can free up your othet hand to dispense the fuel. Make sure the can is clean if you are going to use this technique. Try out this technique first with the water test before committing to using with gas.Once again, be sure to dry out the gas can after testing as I previously described before using with gas OR returning.Finally, there are other cans that have similar dispensers and have a side handle which is very convenient and more user friendly.I hope these tips help you out... Happy Mowing!