Im planning to run from the shower drain to a 'squashed trap?" (not sure what its called, but it is an open drain in the concrete slab that allows 3 x 50mm pipes into it. squashed something ..

My question is - Can I run straight from the shower to the squashthing without an s or p trap?

There is a timber beam thats obstructing me putting a trap directly under the shower. It can be removed but easier not to..


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