Lasting clog-resistant performance ensures proper pond aeration. Silica Airstone Diffusers for Pond Aeration Pumps feature a uniform pore structure for low airflow resistance AND resistance to clogging. The result is even and reliable bubble production for proper aeration (gas exchange) in ponds and water gardens with little or no maintenance. Perfect for use with compact low-pressure blowers or pond air pumps. Self-weighting when used with typical tubing lengths. Machined from a solid block of glass-bonded silica. Silica Airstone Diffusers for Pond Aeration Pumps fit standard 3/16" airline tubing. Small measures 1-1/2" x 1/2" x 1/2" and Medium measures 3" x 1" x 1".
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