Dwyer PTGD-SA04A is a piston-type gauge designed for measuring differential pressure. It has a temperature range of 176°F (80°C) with an accuracy of ±2% FS. The gauge body, piston, and spring are made from aluminum or 316 SS, and the seals are made from Buna-N or PTFE. It can be mounted in any orientation and is compatible with gases and liquids. The pressure limit is 3000 psi (206 bar) for aluminum body and 6000 psi (413 bar) for SS body. It has 1/4" female NPT end connections as standard, with back or bottom connections available. The gauge dimensions are 2.5" (63 mm) or 4.5" (115 mm) and it features an acrylic window.