... used with 3,4,5 gallon water bottle, Neck Dia. of the bottle: 56mm(standard), 58mm. 3.Uses heavy-duty vacuum ... a pressure pot. 4.Simply push down on the top of the pump. Why use SKL Manual Water Pump? 1.No ... . 8.Stable liquid flow. We are the biggest supplier of such kind pumps in China,both hand pump and electronic pump,for 5 ...