Out of stock? Call 215-672-4180 to order.Choose from a sPX piston or cDX balanced diaphragm first stage valves to suit your needs or budget. The sPx piston is extra compact, with two high pressure and four low pressure ports, and is angled for hose routing. The balanced diaphragm is environmentally sealed with two high pressure and four low pressure ports. An optional universal swivel adapter keeps the hose out of your way.