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Quick Details

  • Type: Other Plastic Building Materials
  • Place of Origin: Japan
  • Brand Name: Weep hole
  • Model Number: Series GH

Packaging & Delivery

Packaging Details Standard safe packing or upon your request
Delivery Time depend on size and quantity


1.Simple construction
2.Filter Pipe (perforation with geotextile sheet)
3.For seepage water

Water channels are cracked or may be floated due to seepage water

from the back side , Pilling type Weep hole is used to slove this problem.


If the ground water level around concrete channel is higher than the water level inside channel , the  channel is at risk of structural damage by buoyancy force.

It is necessary to discuss about installing drainage hole to escape accumulated water , and also consider something which prevent water back flow into ground.


WEEP HOLE , drainage pipe with flap valve , consists of PVC pipe and socket with rubber valve. The ground water drain through the weep hole and out to the channel. When the water level in the channel is higher than the level of drainage hole , rubber flap valve of weep hole doesn't allow the water inside channel to go back through the darainage pipe.



 ♦ Ground water from back side of concrete wall goes out to the channel through pipe.


 ♦ Rubber flap valve does not allow the water to flow back into drainage pipe. 


  Case study 

  <Without Weep hole (without drain pipe) >

 At risk of structural damage of concrete channel by buoyancy force of ground water.

  <After set up WEEP HOLE>

 The ground water would be effectively drained with out flow back into ground so that concrete wall could keep stable.


  Other type of products 

We have various kinds of products which is fit for the condition such as sheet pile or tunnel.

We can be flexible to offer customized design . Please contact us without hesitation.





  ♦ It is not applicable where there are many trash or floating substances around.

  ♦ It is not applicable for ocean.


 About us 


  With experiences gathered through dealing with more than 3000 distribution channels in Japan.

  We (Chububika corporation) can offer suitable prodcuts for not only agricultural affairs

  but also Civil engineering materials which is made of PVC or other plastic.


  We are aiming at reliable relationship with customer through a communication

  in business transactions.


  If you have any inquiry or suggestion for our products ,

  Please do not hesitate to contact us.


  We are looking forward to your e-mail.


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