We're here to pump you up. Neck fits Woody's Liter bottle and 16.9 fl oz bottles (dip tube needs to be shortened if used for 16.9 oz liquids)
Remove existing cap from bottle, put pump into bottle and screw onto bottle. Twist spout to unlock, depress once and releases 4 cc of liquid.
Keep it out of the reach of children. Keep the product away from extreme heat and do not freeze it.