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P trap on rain down pipes


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Just preparing for laying the patio and have came across that there's no P-trap or any trap in any of the rain down pipes. The down pipes right into the grid/hopper then into a elbow then away on a horizontal run (slight run). I always thought we needed a p-trap or bottle.

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Posted (edited)

I don't think we have any either. Our 80mm metal down pipes go via a rubber adaptor into 110mm pipe and a bend. We have a lot of trees that shed leaves into the guttering but and they haven't caused any issues.

 

You can get things like this..

 

https://www.screwfix.com/p/floplast-d94-debris-gully/25121?tc=BT2&ds_kid=92700020953276340&ds_rl=1241687&ds_rl=1245250&ds_rl=1249404&ds_rl=1249799&ds_rl=1245250&ds_rl=1249481&gclid=Cj0KCQjw4s7qBRCzARIsAImcAxaVytNqcb5qpVfHvF3QwruB7T-FnMA0fGLkM3Dqpf-rO7xqhaoy6vUaAguUEALw_wcB&gclsrc=aw.ds

 

Edit: I don't think they have a trap, they are just sealed to stop debris on the ground getting in.

Edited by Temp
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