How do you stop a screwable stainless coffee cup from leaking?

- Cup seals might be worn out.

- The locking mechanism might be faulty or loose.

- The top of the cup is not screwed correctly or tightly enough.

Potential fixes:

- For worn-out seals:

1. Check for any visible damage or deformation on the cup seal.

2. If the seal is damaged, remove the cup seal.

3. Purchase and place a replacement cup seal.

4. Screw the cup back together.

- For a faulty or loose locking mechanism:

1. Clean the locking mechanism. Dirt or debris can interfere with the locking mechanism and cause leaks.

2. Contact the coffee cup's manufacturer. Many manufacturers provide replacement locking mechanisms for their cups.

- For improper attachment:

1. Unscrew the cup's top.

2. Check to make sure the seal is properly seated.

3. Screw the cup's top back on tightly. Make sure to turn it until you feel it "catch" and lock into place.