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  Over the years I have had a several different fish tanks.  As a plumber, I would put any type of mechanical fittings or valves into a tank as habitat.  
  Always having aggressive fish, a ball valve provided great refuge to small fish.  Also, a real mean fish will go after its reflection when there is no food.

Step 1: Materials &Tools

You need a ball valve and a Crescent wrench.  * This instructable is on one type of ball valve. The only difference to the other style ball valve is, you put it in a vice and and turn it open with a pipe wrench.* 

Step 2: Break Down

With the Crescent, remove all the nuts including the packing nut under the handle.

Step 3: The Guts

Remove the handle, bolts, O-ring, and Teflon seal.

Step 4: Position Ball

With the Crescent, position the valve stem to the closed position, so the slot will let the ball roll out.

Step 5: Finished Product

In this photo, I have the ball sitting on the packing nut.  Normally the ball just sits in the gravel. This ball valve is also 1 1/4 but several feeders will fit into a 3/4 in full-port ball valve.
 
freakin' awesome!
zinc, lead and brass can poison fish over time. While this ball valve may be stainless steel it might be good advice to add a caveat regarding the types of metal used because folks may use any cool looking piece of metal and not realise they can kill their fish with some metals.<br>Even using different types of rock can change the pH of the water in a tank.
Thank you for your comment and you are most correct. Most of the time I use stainless or nickel plated brass. I also changed up the tank regularly and used this set up as a way to prolong a certain short ending.

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Bio: My full time job as an Organ Grinder keeps me pretty busy but that's just small change. My part time work, as a Mohel ... More »
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