Wika 2.5″ type 233.54 1500 psi gauge – 1/4″ npt lm stainless steel type 23x.54 gauges feature 316 stainless steel wetted parts and 304 stainless steel case and bayonet ring, a laminated safety glass window, and can be liquid filled in the field. These gauges are ideal for process, chemical applications, oil exploration and production, power generation, and pollution control equipment. specifications: connection location: lower mount wetted parts: stainless steel case material: stainless steel case filling: liquid window type: bayonet window construction: laminated safety glass compatibility u.s. Gauge: 540l, 541l