Spring Loaded Backdraft Damper 8" bible and fish bone meal with

and fish bone meal with minerals and natural growth stimulants

Feather meal begins to release nitrogen 4-7 days after application

It has become a favorite in such applications as hydroponics & gardening

and these are suitable for saltwater operation

This commercial air pump with 6 outlets is perfect to run several Waterfarms or multiple air stones at once

Spring Loaded Backdraft Damper 8" bible and fish bone meal withNeoprene damper seal minimizes leakage 20 gauge steel housing, aluminum spring loaded butterfly damper blades Gasket designed to withstand temperatures from 22 F to 180 F Requires from 0. 04 to 0. 08 in. wg pressure to open Simple installation in any position entire assembly inserts into duct Exterior foam gasket assures a tight seal against duct