Diffuser Open Spiral Multi-Plane Fine Bubble Material of Construction Schedule 40 PVC LDPE Length 11 1/4 In. Width 10 1/2 In. Height 3 In. Flow Interference 0.85 In. Active Surface Area 192 Sq.-In. Linear Lift 144 In Fitting Size 1/2 FNPT In. Air Requirements 1.5 to 4.5 SCFM Ideal For Depths Over 5 Ft. Requires Ballast Connection Kit Splice Kit Special Features Thoroughly Aerates and Mixes Application Recreational Ponds and Lakes