This 3/8" clamp is designed to hold the Auto-Siphon 3/8" Racking Cane in place on your bucket or carboy. Simply snap it on your Auto Siphon and slide it down onto your bucket or carboy, and your Auto-Siphon will be held securely above sediment, allowing you to use it hand-free and worry-free. This clamp also works with the 3/8" Mini Auto-Siphon for gallon jugs.