Installation:

Step 1

If your aquarium has water inside, please empty half tank out.  If it's a new empty tank than go ahead with installation. 

Step 2

Glue (included) the L shaped plastic joint to both sides of the glass air tube.

Step 3

Get a short soft plastic tube connect one side to the glass air tube joint, the other to the airstone.

Step 4

Apply glue to the back side of the air glass tube where it will be fixed at one of the back corner (right angle) of the aquarium.

Fin Effect

There, you can hardly notice.  Once the glass air tube is installed, you will not have old eroded plastic tubes floating around the tank.  It makes your tank neat and clean, plus it also functions as a reinforcement for the corner of the tank where you place the glass air tube.