How to stop leak of water tank while steel rod enters and exits?

AI Thread Summary
To prevent water leakage from a plastic water tank while allowing a steel rod with a ball to pass through, a sealing mechanism is essential. The rod needs to enter and exit through specially designed openings that can accommodate movement without compromising the tank's integrity. Options include using rubber grommets or seals around the rod to create a watertight fit. Additionally, ensuring that the ball at the end of the rod is appropriately sized will help maintain a secure seal. Implementing these solutions will allow for the rod's movement while keeping the tank leak-free.
Burhan
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Hi:

I have a tank of water (of plastic) of about 2 x 4 feet.

I want a steal rod (with a ball of 5 inch at end of rod) to be cross that water tank from center, but water should not leak from tank (rod will enter from right and exit from left of tank)

You can get more idea from image that i have tried to create.

http://s14.postimage.org/4ddkbnirl/engin.jpg

Please see it and tell me how it is possible.

Plus: ofcourse water tank will have some cutting for rod to enter and exit.
And my system only needs rod to enter from a side (not top)
 
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More details please. Why must it do what you want it to do?
 

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