MixAirTech Sinking Hose, Black, 3/8-Inch/100-Feet The simplest way to get air to your diffusers without ruining the aesthetics of your pond Virtually invisible once it is connected and in place Extremely durable, does not kink and remains flexible even in cold weather This inside of the tubing has a smooth bore finish so there is less resistance which makes your aeration system more efficient Allows for easier installation, placement and maintenance of diffusers without the hassle of bricks and ties to keep tubing in place