Dwyer PTGD-AA04A is a piston-type gauge designed for measuring differential pressure. It has a temperature range of 176°F (80°C) and an accuracy of ±2% FS. It can be mounted in any position and is suitable for use with compatible gases and liquids. The wetted materials include aluminum or 316 SS for the gauge body and piston, 302 SS for the spring, and Buna-N seals. The pressure limit is 3000 psi (206 bar) for the aluminum body and 6000 psi (413 bar) for the SS body. It has 1/4" female NPT end connections as standard, with 1/4" female NPT back or bottom connections also available. The dimensions are 2.5" (63 mm) or 4.5" (115 mm) with an acrylic window.