The Blichmann AutoSparge is extremely helpful when sparging or recirculating your mash. Designed to regulate the flow of liquid being allowed onto the top of your grain bed. If the floating ball is all the way down, the flow rate will increase. As the ball begins to rise with the liquid level, the flow rate slows down, preventing an overflow. Simple, yet effective! Requires at least a 12" inner diameter kettle, keg, or cooler. Includes 18" of silicone tubing and foam tubing float ring.,,Installation requires a 13/16" mounting hole. Max 10 psi; cannot accommodate city/well water pressure.