Oceanic SPX clearance priced

[ddown]

I've noticed a few of these on clearance prices. Unbalanced Piston, Balanced second, Coldwater rated. I wonder if it takes SP5 rebuild kits? Seems like the only Unbalanced piston with 2 HP ports and decent port arrangement. Comments

 

[ddown]

has anyone even seen or used one of these regulators?

 

[Couv]

If it's an unbalanced piston it would more likely take a MK2 seat than a MK5 seat.

Edit: I have manuals for the SP4/5/6 and they all look similar to a MK2.
If I'm deciphering the drawing correctly, the piston head o-ring size is a -023 and the piston stem seal is a -008

 

[ddown]

I'm looking for unbalanced piston the nice unique feature is 2 HP ports thanks for information.