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Horseshoe Mouth
Guizhou ventilation pipe is a DN50 pipe that needs to be connected to a DN80 pipe. There is no DN80 * DN50 reducer for three-way connection, so only a
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Guizhou ventilation duct
A DN50 pipeline needs to be connected to a DN80 pipeline. There is no DN80 * DN50 reducer to make a three-way connection, so a hole can only be opened on the DN80 pipeline. For the convenience of welding when drilling, the DN50 pipe mouth should be polished into a groove that can be directly clamped onto the DN80 pipeline. This groove is similar to a horseshoe, which is the horseshoe mouth.

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