This stainless stone with 1/4" hose barb and 1.5" tri-clover compatible fitting is perfect to aerate the wort before pitching the yeast. Commercial breweries try to achieve 8-10 ppm of dissolved oxygen in the wort. Achieving 8ppm can be done with just air and a deep water aquarium pump, but to achieve 10ppm pure oxygen is needed.
To use this kit, sanitize the stone and racking port valve on the fermenter and attach the stone. You can deliver air to the stone using a deep water aquarium air pump and a (preferably HEPA) inline filter. Once connected, turn on the pump and open the valve. Recommended aeration time is 10-15 minutes to achieve 8 ppm dissolved oxygen in your wort. Assembly is required.