Q: What are standard corny keg sizes and dimensions (height / diameter)?

A: The most common sizes are 3 gallon and 5 gallon kegs, with typical measurements listed in “Corny Keg Sizes and Dimensions.”

Q: Ball-lock vs pin-lock, what is the difference and which should I buy?

A: Ball lock uses smooth posts and slimmer shells, pin lock uses pinned posts and wider bodies, and “Types — Ball-Lock vs Pin-Lock” explains which makes more sense for your space.

Q: What is the safe serving pressure and max working pressure for a corny keg?

A: Most people serve at 8 to 14 psi and stay comfortably below the manufacturer’s stamped max working pressure, which is covered in “Setup” and “Carbonation.”

Q: How do I force-carbonate quickly without overcarbing?

A: Use the “Carbonation” section for a simple force carb routine that balances higher pressure, gentle agitation, and controlled venting.

Q: Can I ferment in a corny keg with a spunding valve?

A: Yes, “Fermenting in a Corny Keg” shows how to pair a corny keg fermenter lid with a spunding valve and safe pressure limits.

Q: What O-ring sizes do I need, and how often should I replace them?

A: Your keg’s manual or rebuild kit lists exact sizes, and the “Cleaning, Sanitizing and Rebuilds” section explains a sensible replacement schedule.

Q: How do I fix a leaking PRV or lid seal?

A: Clean, inspect, and replace the PRV or lid O-ring as needed, following the leak testing steps in “Setup” and the tips in “Troubleshooting.”

Q: How tall is a 5 gal corny keg with disconnects attached for kegerators?

A: Expect a standard 5 gallon corny keg to gain roughly 2 inches over the bare shell height once ball lock disconnects are installed.

Q: New vs. used kegs: what should I inspect before buying?

A: Use the “Buying Guide” checklist for damage, corrosion, post threads, dip tubes, and seals so that you only bring home kegs you can trust.

Q: Can I carbonate sparkling water in a corny keg?

A: Yes — a corny keg is one of the easiest ways to make (and serve) sparkling water at home. Use clean water, chill it cold, and carbonate with CO₂ at an appropriate pressure. Biggest “gotchas” are temperature (cold = faster/better), leaks, and not exceeding your keg/PRV limits.

Q: Will breweries fill my corny keg?

A: Sometimes, but many won’t. It’s highly policy-dependent (and sometimes dictated by local regs/liability). Corny kegs also aren’t standard in many brewery workflows (most are set up for Sanke), so even a willing brewery may not have the right fittings. Call ahead and expect “no” to be common.