Had an electric pump attached to a 5 gallon water jug in my office but wanted the pump on the coffee pot/keurig for ease of filling the pot/tank by turning on the pump instead of taking it to the water that sat on the floor. All you need to do is pull the safety seal off the water, leaving the plastic collar around the top of the bottle. This cap friction fits to the top with the collar on it. Pass the hose through the cap and pierce the foam gasket/seal and you're on your way.
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