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I’m installing a gravity fed system off my bathroom, and the plumbing for bath and sink attach to the 2” drain/standpipe on the exterior of my home. This is an ideal place to put a three way valve and backwater valve, however the pipe is vertical and I’m having trouble finding a backwater valve that can be installed on vertical pipe. How are other addressing this? Is there a vertical backwater valve? Do I have to dig up the  drainpipe once it becomes horizontal underground?

thanks in advance!

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Hi,

Without seeing a picture I’m not sure how helpful I can be (and feel free to post a picture of the plumbing if you’d like).

Two ideas:

  1. Backwater valves are required/needed when the drain is “subject to backflow.” If you are intercepting the water at a point higher than other drains there may not be a way for sewage to back up. For example, a vertical shower drain coming from a second story shower/bath would not be subject to backflow  if there was a fixture below it where sewage could/would back up and overflow out of before any sewage could back up into the greywater drain diversion. Hope this makes sense.
  2. You could plumb a horizontal backwater valve along the side of the house before connecting back into the sewer drain. This may look a little odd, but it would be functional. You’d install the 3-way valve like an upside down T, on side would take greywater over and down to the landscape, the other side would connect to a backwater valve and then 90 down, 90 over, and connect back into the vertical sewer pipe.

Good luck with your project!

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You have revolutionized my thinking! I’ve uploaded a photo with mock up of what I am now thinking based on suggestion 2. Due to the downspout on the left I am going to orient the T diverter (In red) to the right where it will deliver grey water (in grey). I will install a series of 90 degree turns (in green) with a horizontal backwater valve (in orange) before connecting back into the sewer line. Any suggestions on how much pipe should be used between 90 degree turns?

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You have revolutionized my thinking! I’ve uploaded a photo with mock up of what I am now thinking based on suggestion 2. Due to the downspout on the left I am going to orient the T diverter (In red) to the right where it will deliver grey water (in grey). I will install a series of 90 degree turns (in green) with a horizontal backwater valve (in orange) before connecting back into the sewer line. Any suggestions on how much pipe should be used between 90 degree turns?

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