Stanley’s Trigger-Action Lid is designed for easy, one-handed sipping, whether you’re on a hiking trail, road trip, or dog walk. Press the button to open. When you let go, the lid closes tight, so your travel mug becomes leakproof.

What makes this two-piece lid so innovative can also make it tricky to take apart and put back together. We’re here to help. For complete instructions, check out the following.

1. Turn the lid upside down.
2. To separate the pieces, press down on the handle while turning it counterclockwise.

1. Insert the bottom piece into the top piece, making sure the trigger-action mechanism lines up with the hole.
2. Press down on the handle while turning it clockwise. The bottom piece will click into place.