Red Line Glass Rod Kit, Gauge Glass Diameter 3/4 in, Gauge Glass Length 36 in, Center to Center Length 38 in, Glass Tube Material Borosilicate, Glass Style Red Line Glass, Rod Material Bronze, Media Temperature - Maximum 300 Degrees F, Included Components (4) Bronze Rods, (1) Glass Tube, Operating Pressure - Maximum 400 psi, Standards ASME