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

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SUMMARY

To prevent water leakage from a plastic water tank while allowing a steel rod with a 5-inch ball at the end to pass through, a sealing mechanism must be implemented around the entry and exit points of the rod. The design should incorporate flexible seals or grommets that can accommodate the rod's movement while maintaining a watertight barrier. Additionally, the tank's dimensions of 2 x 4 feet must be considered to ensure that the seals fit properly and function effectively during the rod's operation.

PREREQUISITES
  • Understanding of sealing mechanisms for fluid containment
  • Knowledge of materials suitable for waterproof seals
  • Familiarity with basic mechanical design principles
  • Experience with custom fabrication techniques
NEXT STEPS
  • Research flexible sealing solutions such as rubber grommets or O-rings
  • Explore materials that provide waterproof properties and durability
  • Learn about mechanical design considerations for moving parts in fluid environments
  • Investigate custom fabrication methods for creating entry/exit points in tanks
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Engineers, DIY enthusiasts, and anyone involved in designing or modifying water containment systems who need to manage fluid dynamics while allowing for moving components.

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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