Perfect seal, no leaks. It's a bit difficult to install a 31/64 drill. I made 4 5 gallon plastic containers, it will take some time to get them down the hole but if you don't you will damage either the vent or the gas bottle. There is actually a smaller diameter tube of about 1/8 inch that you will use to get started. Then close the lid and gently tap with a hammer. All 4 containers don't leak, I recommend them cheaper than buying a spout and vent. Thing is, the spout that came with your container works just fine. It's great to actually fill my tractor with gas in about a minute compared to the 5-8 minutes it took without the vent.
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