Cooling Probe designed for a standard pin-sized cask.
Simply put the stainless steel portion of the probe into the bunghole and tap on the plastic end to seal in place whilst serving (venting normally using a spile in the hole at the top). Designed to pump chilled glycol or water through the probe using the inlet and outlet barbs at the top.
This probe is perfect for beer festivals as it keeps you whole cask at a desired temperature - or use it in your taproom, when you don't have the space for a dedicated cask cooler!