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Blowing-down sight glass

Fizz
Member Posts: 532
WM-SGO3, from 80's, with dirty sight glass half-way. Want to loosen petcock to blow-down, but not sure what to loosen. There's a nut similar to my 2000 SGo-6, on bottom of assembly, but also a detailed-like attachment on nut-do I turn nut, or other attachment?
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Comments
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If you want to drain the sight glass regularly, replace the pet clock with a quarter turn ball valve, and some piping to accommodate a bucket to catch the dribbles.
My experience with those petcocks has been: once open-never close!—NBC0 -
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This 1000 times. I did this after seeing @Steamhead and @Gordo doing it on their installs.nicholas bonham-carter said:If you want to drain the sight glass regularly, replace the pet clock with a quarter turn ball valve, and some piping to accommodate a bucket to catch the dribbles.
My experience with those petcocks has been: once open-never close!—NBC
Makes it super easy to keep it clean.2014 Weil Mclain EG-40
EcoSteam ES-20 Advanced Boiler Control
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Excellent advice, thanks guys!0
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