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[–] 0 pt 4y

What does the collar do? My experience is that if the seal is broken between nozzle and gas tank then it soon shuts off. I read years ago that vapors are vacuumed back in attempt to reduce "polution".

[–] 0 pt 4y

You're right about the vapors. But it's just a switch that the collar engages. Pull back the collar and you can spray it in the air.