Self Weighted 10 inch HD Membrane DiffuserQuick Sink Self Weighted Diffusers offer the same membrane diffuser performance but now have a self sinking design. Single and Dual diffuser models available Recommended Airflow: . 8 3 cfm (single) 1. 6 6 cfm (dual) Self weighted base with powder coated finish Sch. 80 PVC air manifold check valve Includes inlet air fittings for 3 8", 1 2" or 5 8" tubing; tubing clamps and strain relief Self weighted design eliminates need for gravel, reduces