Apeks Xtx 50 Ds4. The DS4 First stage.The performance of the DS4 first stage is the same as the TX 40 and 50 first stage DST first stage but has no swivel turret for the LP ports.The NEW MODEL DIN version DS4 has a metal wheel on the DIN connector.4 MP ports 38 UNF 1 HP port 716 UNFAvailable in 200BAR3000 PSI Yoke or 300B4260PSI DIN System. 2ND STAGE XTX50 Adjustable cracking control Integrated venturi control Pneumatically balanced valve design Micro Adjuster Suitable for cold water use Bright Chrome Finish Right or Left hand hose configuration