Every Brewer/Syphoner should have a couple of these Plastic Syphon Clamps to control flow whilst Racking Off and Syphoning their Brew, especially when filling bottles. So easy and essential for the totally mess free transferring of liquid. As important for life’s day to day comforts as the Hoover, Sellotape, Sliced Bread, Black & Decker Workmate, Electric Blanket, Car, Oven Ready Chips, Cycle Clips, (must be more than this!?) etc. etc.