Pipe direction
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Is this 3/4 pipe at a 45-degree angle downward?
If it refers to the thin short line, it certainly isn’t at a 45-degree downward angle
No, the DN20 pipe is at the same elevation as the main pipe; it’s just oriented in the northeast direction
Yes, 45 degrees downward from true north; there’s a 45-degree mark there, and the two straight sides of the triangle are equal in length.