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I have one that came in my American Tank Aux tank - is a 3/8" fitting with internal rollover valve and a 90-degree 3/8" hose barb. Top is stamped: "TEMCO 90-02622"


 

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OK, What is this thing used for?
 

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John R said:
OK, What is this thing used for?

It's a fuel tank vent (off my aux tank) that is a safety feature. It vents normally when vertical, but if inverted (as in a rollover), a ball bearing and nylon slug gravity close it off to prevent fuel from spilling out the vent line.
 
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