HP hose with no opening?

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That's what it's supposed to be like. Little tiny hope on the side of the first stage. Other side should be big enough to accept the spool for your spg and then your spg
 
they have itty bitty hole to keep the volumetric flow to a minimum in the case of a HP failure. HP failures actually flow significantly less air than a LP hose failure.
 
This hole is made just to give SPG a taste of pressure, not to move large quantities of air back and forth. The SPG does not consume air.
 
That tiny hole is by design. It keeps the HP from overwhelming the gauge with too fast a move from 0 to 3000+ psi, and it limits the rate of gas loss in the event of a hose or SPG failure.
 
What they said. :)
 
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