Apeks XTX50 DS4 RegulatorThis first stage goes to the extreme and never disappoints making it the regulator of choice for technical divers around the world. This regulator is similar to the XTX50 mentioned previously less the rotating turret. The compact first stage is ideally suited for twin manifolds or for use on a single valve. The one high pressure port and four low pressure ports are positioned for most common technical diving rigs. The over balanced first stage