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	$6.64 Buy 12 for $6.31 each and save $0.33
AD42	0.4	4.2	6.5	$12.73 Buy 12 for $12.09 each and save $0.64
AD52	0.5	5.2	8.2	$14.00 Buy 12 for $13.30 each and save $0.70