Pressure regulator

[jrb2]

Bought this pressure regulator at Northern Tool today, on the clearance rack for $50.

http://www.northerntool.com/shop/tools/product_36609_36609

Got it home and I am looking at it and notice that there are two 3/8 ports for the in an out that are plugged with red plastic plugs. There are two other ports on the sides that appear to be for a gauge as there is only a tiny hole at the bottom of the openings. Above these ports, cast into the housing are the letters GA with an arrow underneath. Nowhere is there any indication of in or out for any of the ports. Does anyone have a guess as to what GA stands for and can I assume that the arrow indicates the direction of the air flow?

 

[JJThrasher]

Arrow is flow and GA is gauge.

 

[jrb2]

Thanks!

 

[Richard Cranium]

yep, arrow is flow and ga is gauge.

 

[Milton Shaw]

Some of those could have holes to put two gauges on it. One for the inlet pressure and one for the outlet pressure. That way you can see how the system is working. Or you could have two quick couplers on it, one for full pressure, one for regulated pressure.