There are two nipples,one would be the fill nipple but what does the other one do? The out nipple?
There are two nipples,one would be the fill nipple but what does the other one do? The out nipple?
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If there are two "nipples" then one is the fill nipple (the back one) and the other is user installed and may be a quick connect male nipple.
The ports are clearly marked LP - Gun or HP - Tank. The HP ports are for filling or a HP gauge and the LP ports for sending pressure to the gun and LP gauge. Can't get much simpler than that.