... plated, 316 stainless steel,phosphor bronze and so on. Element: Brass, CONNECTION:1/8", 1/4", 1/2", 3/8", NPT,BSP ... BSPT dependent on model& size.Bottom, back left &right side connection AVAILABLE RANGES:30Hg "- 0-15-10000PSI WINDOWS: Acrylic, glass& polycarbonate ...