Cornelius Kegs: Ball Lock, Pin Lock and Used Inspection

Used Cornelius kegs are one of eBay’s natural homebrew strengths. The stainless body may be durable, but lid fit, posts, poppets, dip tubes and seals determine whether the keg is actually ready to use.

Buy the complete workflow, not the most impressive isolated component. Missing adapters, seals, power requirements and cleaning access are part of the real price.

Confirm the connection system

Ball-lock posts usually use separate gas and liquid disconnect profiles; pin-lock posts use pins. Do not assume parts interchange. Verify the exact post thread when ordering replacements.

Inspect pressure surfaces

Look for dents near the lid opening, damaged feet, rust at welds and distorted posts. Cosmetic sidewall dents may not affect function, but damage around sealing areas can.

Rebuild cost belongs in the purchase price

A used keg may need O-rings, poppets, posts, pressure-relief hardware and dip-tube cleaning. Create a line-item rebuild estimate before deciding between a single keg, a refurbished keg or a multi-keg lot.

Completed sales help with local-versus-shipped value

Kegs are bulky. Shipping can change the apparent bargain. Compare delivered cost and inspect lot listings for mixed connection types or missing lids.

A practical inspection checklist

• Confirm capacity, dimensions, model number and included parts.
• Photograph labels, plugs, fittings, valves and sealing surfaces.
• Price missing or questionable components before buying.
• Compare delivered cost against completed sales.
• Replace unknown tubing, worn seals and damaged food-contact parts.