Robust-Aire Diffuser Assembly Robust-Aire™ systems pump compressed air from a shore-mounted compressor through self-weighted lines to a diffuser on the pond, lake or tank bottom. The diffuser then continuously releases micro-bubbles that rise to the surface carrying large volumes of water. This induces oxygen-transfer as well as beneficial water movement and mixing. Instead of HDPE plastic the Robust-Aire Diffuser assembly now comes with a metal base for a more rigid support. What's included: Vent Plug 3/8" Tubing Clamp 5/8" Tubing Clamp 1/2" NPT X 3/8" Barb Elbow 3/8" Tubing Strain Relief 5/8" Tubing Strain Relief 1/4"-20 x 1-3/8" Hex Head Capscrew (2) Flat Washer 1/4"-20 Lock Nut Not all fittings will be used. Use 3/8" fittings with 3/8" Suresink Aeration Tubing and 5/8" fittings with 5/8" Suresink Aeration Tubing. Kasco Redesigned Robust-Aire Diffuser Assembly Instructions ASSEMBLY MANUAL PRODUCT FLYER