I just got my sprinkler system winterized and noticed this nut is

How to Turn on Your Sprinkler System After Winter

Winterization – Next Rain Irrigation Ltd. Calgary

Any reason this pipe should be open? There is another one nearby

Houston homes continue to recover from damage caused by hard freeze – Houston Public Media

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How to Winterize Your Sprinkler System

Any reason this pipe should be open? There is another one nearby

How to Winterize Your Sprinkler System - The Home Depot

Any reason this pipe should be open? There is another one nearby

Winterization – Next Rain Irrigation Ltd. Calgary

Any reason this pipe should be open? There is another one nearby

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CAMCO 36543 RV Pump Converter Anti-Freeze/Winterizing Kit

Any reason this pipe should be open? There is another one nearby

I just got my sprinkler system winterized and noticed this nut is leaking water. A little unsure what's going on since I got the system blown out and my water is turned