These diffusers are made from fused alumina. They produce a bubble size of 1–2 mm and require a higher pressure than Sweetwater® medium-pore diffusers. They have a molded square rubber support on each end that supports and protects them from tank bottoms and protects the tank or liner from the diffuser. They fit both 3/16" and 1/4" tubing and are 1.2" in diameter.

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Model	CFM	Length (in)	AES	Price
AD32	0.3	3.2	5	$6.23 Buy 12 for $5.92 each and save $0.31
AD42	0.4	4.2	6.5	$11.94 Buy 12 for $11.34 each and save $0.60
AD52	0.5	5.2	8.2	$13.14 Buy 12 for $12.48 each and save $0.66