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The Marsh PDP-40 Differential Pressure Gauge measures the difference between two pressures in a system and has a dial size of 4".
| Accuracy | ±2% Full Scale (Ascending) |
| Dial Size | 4" Diameter |
| Case | Stainless Steel (SS 304), Engineered Polymer |
| Sensing Element | Piston |
| Wetted Parts | Aluminum or 316SS |
| Ranges | 5-1000 psi or equivalent ranges in other units |
| Maximum/Static Pressure | 3000 psi - Aluminum 6000 psi - 316SS |
| Connections | 1/4" NPT (F) and others through adapter |
| Port Configuration | In-line, rear, & bottom. |
| Mounting | Direct, front flange, 2" pipe & surface mounting |
| Seals | Buna-N, Viton, or EPDM |
| Window | Glass, safety glass, or acrylic |
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