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How would I seal in this shower drain?

here is the abs drain out and in and I'm wondering if:

  • I even need to seal it
  • concrete
  • silicone?

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So your shower floor is the foundation? – DMoore Aug 18 '13 at 3:47
no. there is a short subfloor, resting on 2x4s then 3/4 plywood. that's how it was when we moved in. I'm fixing some rot. – cbrulak Aug 18 '13 at 5:44
There's no plumbing in the concrete? – The Evil Greebo Aug 18 '13 at 10:29
not sure, can't see that far. It looks like just a straight concrete tube – cbrulak Aug 18 '13 at 16:36
The drain fitting is supposed to fit onto a drain pipe leading down to a trap. All I see in the photo looks like concrete formed against the drain fitting -- no pipe. This doesn't look right. – bcworkz Aug 21 '13 at 2:46

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