It's a burst disc, for lack of a better term. If a full untapped keg were to become over-pressurized, it will blow out there before becoming a 15 gallon bottle bomb.
If they are coming from your plants, they are fungus gnats. They live in the soil of your plants. Use Neem Oil to get rid of them, Home Depot/ Lowes should have it. Add it to the water you are watering your plants with. It will take about 2 to 3 weeks to kill them all. There are other faster...
I guess this is where a spray bottle of star-san would come in handy. Just spray up into the spigot until it drained clear. I have heard many people on here doing it that way. The question I have is how do you prevent your airlock from getting sucked dry when you do this?? If you remove enough...
The first thing to do is have a lab do a soil test, your state agriculture dept will usually do them for free or for a small fee. If you have a local college with a Ag dept, they might be able to do it also. The results of this test will tell you exactly what you need to do to your soil...
@JMP138 Homesteaders Brew Supply in Fuquay has Rahr 2-row for $38/bag. Talk to Adam there and he can let you know pricing on other bulk varieties. I drive past it 4 times a week so maybe we could work out a shuttle to save you the trip. PM me if interested.
I've had a 2L stater overflow a 1 gallon jug before. it continued to do so for over 12 hours. Ended up tossing it because I didn't think 1056 was the only thing in there.