The Marine Metal Products Bubble Box⢠Air Pump features a weighted airstone that helps to keep the air pump quiet while it pumps 7/8 L/min. of air to aerate up to 7-1/2 gallons of water. The pump features an adjustable stainless-steel clip and fasteners for an optimal and secure mount. Marine Metal Products Bubble Box⢠Air Pump - Aerators And Fishing Lights at Academy Sports