TERA PUMP 2 Extension Tubes for 2-3 Gallon Water Bottle for Dolphin Drinking Water Pumps BPA Free Now you can use Dolphin Drinking Water Pump for 2-3 gallon water bottles with these extentions Include - 2 Lower Tubes Extenstion (8 These short lower tube allow your pump fitting 2 - 3 gallon water bottle (regular lower tube for 5 gallon bottle is 10 When your original part breaks. This will replace the old part. When you need extra replacement this will be a perfect fit