カフェ用ノックビンラバー

I was worried about getting a knock tube that didn't fit, but this rubber seal pressed in perfectly and has made tamping much quieter.

Bought this as a replacement and it fits perfectly into the knock tube. The rubber is much softer than the original, which helps prevent scratching my portafilter. No more loud clanking noises when I knock out the puck.

The original rubber had gone rock hard, but this replacement fits the knock tube perfectly and has that grippy, solid feel again. It took about two minutes to swap out and it's been working flawlessly every single morning since.