Professional tap container for the perfect espresso preparation If you're a lover of freshly ground coffee and use your espresso machine regularly, you know that cleaning the machine can be a chore. But with our knock off container, cleaning your espresso machine is a piece of cake! Here are a few reasons why our knock box is the perfect tool for you: 1. High-quality materials and workmanship Our drain container is made of recyclable plastic and has a perfect size of 13.5 x 13.5 x 12 cm. It is designed to be easy to use and clean.