Scubapro HFP LP Port

[SereDiver]

I picked up a Scubapro MK 16 first stage as a back up recently and I noticed when setting it up that it had a couple of ports labled: HFP LP. What are these ports for; primary second stage, octo, BC LP inflator hose? There are two ports with this labling. Thanks in advance for the info.

 

[Wayward Son]

as I recall, they're high flow LP ports. Supposed to give you better performance on your 2nd stages. Don't think any of my regs have one.