Marinades and meat juices belong in the bag, not in the pump. This small insert from Zwilling's Fresh & Save range attaches to the valve on the inside of the vacuum bag and acts as a barrier. Liquid drawn towards the valve collects in the insert, giving you time to switch off the pump before anything reaches it.
Six plastic inserts that fit Fresh & Save bags. They withstand up to 90 °C, can be frozen and are dishwasher safe.