This listing is for TEN (10) Gas Can Vents! Pre-drill (with a 1/16” drill bit) a small hole on top of the can, opposite side of the spout. Choose an area where the vent will be above the “full” line. Drill the final hole with a (31/64"), 1/2” is close enough, boring bit. Be gentle when drilling, and check can for any debris! Now that you have your 1/2” hole, install the vent by pushing firmly to seat or by tapping gently with a hammer. You are now ready to vent.