The Pisces Pro Acclimator is a self-priming, valve-controlled drip, hang-on device used to acclimate fish and invertebrates into their new home. To use, place your new specimen into a plastic container. Hang the plastic hook over the side of your aquarium and place the valve into the plastic container. Start the siphon, then adjust the valve to a steady drip of approximately 1 or 2 drips per second. The valve controls the volume of water entering the acclimation container.