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its the gas flowing into your unit that produces the cold air the gas is cold so your pipe slightly freezes
Absolutely Not!
natural gas line
Exactly waht it sounds like - flooding/flushing/purging something with nitrogen gas (often to exclude oxygen (air))
No.
It is Natural Gas Pipe Line Regulator
It is Natural Gas Pipe Line Regulator
Yellow
Yellow
to introduce air or gas into a system
Is that Flushing, New York, -Flushing, Michigan, - or possibly Flushing, Netherlands.
Use only black pipe