XTX 50/40 Regulator package comprises of:

Apeks DST4 1st stage (Dry Sealed 4LP port with Turret)
Apeks XTX50 2nd stage with Venturi control and crack resistence dial, plus interchangeable exhaust vents.
Apeks XTX40 Octi with 90cm Braided Miflex Yellow Hose
Atlantis SPG1 2.5" Brass SPG with 80cm HP hose.

The XTX50 Regulator by Apeks is one of our favourites, it breathes amazingly well, and can be configured for many types of diving. Dry Sealed Swivel Turret 1st stage design. 

This is our most popular regulators over the last 10 years, with many of the Global Dive team using this model. A solid high end all rounder.