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These oversized O-rings are to protect diffusers from abrasives like concrete or to protect a tank from the abrasive diffusers. Use two each diffuser (or air stone.) These heavy duty O-rings are made of Buna 70 for easy stretch over 1 1/2″ square diffusers. Diffuser Bumpers . . . → Read More: Diffuser Bumpers 
100 % Glass-Bonded Silica Air Diffuser 1.5″ x 1.5″ x 9″ w poly connectors, Medium Pore 1.5″ x 1.5″ x 9″ w 1/4″ barb connector Medium Pore Air DiffuserSuggested CFM .75Weight 1.35lb 1.5″ x 1.5″ x 9″ w 1/2″ MNPT connector Medium Pore Air DiffuserSuggested CFM .75Weight 1.35lb 1.5″ . . . → Read More: 9 Inch Glass Bonded Silica Medium Pore Air Diffusers 
100 % Glass-Bonded Silica Air Diffuser 1.5″ x 1.5″ x 3″ w poly connectors, Medium Pore 1.5″ x 1.5″ x 3″ w 3/16″ barb connector Medium Pore Air DiffuserSuggested CFM .35Weight .39lb 1.5″ x 1.5″ x 3″ w 1/2″ MNPT connector Medium Pore Air DiffuserSuggested CFM .35Weight .39lb 1.5″ . . . → Read More: 3 Inch Glass Bonded Silica Medium Pore Air Diffusers 
100 % Glass-Bonded Silica Air Diffuser 1.5″ x 1.5″ x 12″ w poly connectors, Medium Pore 1.5″ x 1.5″ x 12″ w 1/4″ barb connector Medium Pore Air Diffuser.Suggested CFM 1.00Weight 1.50lb 1.5″ x 1.5″ x 12″ w 1/2″ MNPT connector Medium Pore Air Diffuser. 1.5″ x 1.5″ x . . . → Read More: 12 Inch Glass Bonded Silica Medium Pore Air Diffusers 
100 % Glass-Bonded Silica Air Diffuser 1.5″ x 1.5″ x 6″ w poly connectors, Medium Pore This is the size air stone I use in my DWC raft beds every 4 feet. 1.5″ x 1.5″ x 6″ w 1/4″ barb connector Medium Pore Air Diffuser.Suggested CFM .50Weight .75lb 1.5″ x 1.5″ . . . → Read More: 6 Inch Glass Bonded Silica Medium Pore Air Diffusers |
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