The new Ashcroft Type 5503 differential pressure (D/P) gauge provides reliable low – differential pressure measurement in high-static, wet-wet pressure applications. Equipped with wetted materials of 316SS, Monel, or Hastelloy C, the rugged Type 5503 D/P pressure gauge is specifically designed to monitor a wide variety of caustic liquids and gases. Four-inch and 6-inch dial face versions are available in ranges from 0/3 (or 0/100 in H 2 O) through 0/400 psid. These offer optional features such as 3,625-psi static pressure containment, liquid fill, electrical contacts, and a choice of mounting hardware. (