This dispensing lotion pump fits perfectly in 3.98L (1.05 US Gallon) plastic jugs. It reaches completely the bottom to prevent any product loss. Finish: 38/400 Total Length: 13 1/4" (33,7 cm) Dip Tube Length: 12" (30,5 cm) from the bottom of the screw disc. Closure: Lock down head (it will "pop" upwards after opening) Discharge per pump: 10 cc Packaging: Clear plastic pouch, sealed. The pump and the dip tube must be assembled before use. How to use: With one hand, hold firmly the bold ribbed smaller ring that is located above the fine-ribbed larger ring, (also called "continuous thread closure") screwed directly onto the bottle. If you hold this larger ring, the opening mechanism will not engage. Then, with the other hand, turn the pump in the direction indicated by the engraved arrow on the top of the pump. It will "pop" upwards to reach its full height (15 3/4 " - 43 cm). Then, press the pump several times until the liquid rises to the top of the pump.