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Of course it was good with a 45-degree elbow.
Addendum: Use 45 degrees, the pipe will come out when laying bricks, so the ground will be too high, so, use 90 degrees. Whether it is clogged in the future depends on the use situation, and in the family, do not pour anything into the sewer when you use it.
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The sewage pipe specification can not use a 90-degree elbow, but the rainwater pipe can.
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Of course, 45 degrees is good, if it affects the appearance, you can consider using two 45 degrees to spell one 90 degrees, which will be better.
You can put the sewer pipe in the wall.
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Where is it used? What is the diameter of the pipe?
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Generally, it is done at a right angle, and if it is not a right angle installation, it must be a bit difficult and not beautiful.
The water pressure is too high, and the water pipe must be tested for pressure when it is installed, otherwise there will be endless troubles.
The sewer pipe is better to use a round one - its cross-sectional space is suitable for the largest outflow of things. The flat pipe virtually reduces the size of the object passing through.