apeks din

This might be a dumb question, but in my 1st stage the o-ring appears to be flatten. I bought it new and dove w/ it for ~10 dives. I started to look at the o-ring because today when I plugged the regs into my HP tank the bleed hole starts to leak air. Is it normal to have o-rings to be flat? I...

I got this DIN regulator from a friend. It has the 5th port. It looks in great shape but I don’t know its history apart from the fact that it has not been in the water for at least 2 years so it definitely requires servicing before use. Asking 250$ plus shipping.

I have a set of Apeks regulators (DIN)(XTX200 reg, XTX50 octo, 2 gauge console) that I purchase as a replacement to my old Aqualung gear. The regulators are out of the box, but have never been used. If you were to purchase this package new it would be $1,200-$1,300. I will let them go for $800...