Thorium Racking Cane Auto Siphon Tube Clip Clamp Holder | 1/2" size | Two Pack SIZE - Clamp for 1/2" Auto Siphon DURABLE - Strong plastic construction MULTIPLE USES - For Fermenting Bucket or Carboy or Holding Siphoning Tubing. Easy to use clip on and clip off function. PREVENTION - Holds Racking Cane in Place as to prevent siphoning of sediment from bottom of bucket or carboy TWO PACK - Convenient to order two pack...because two is always better than one.