Wika 2.5″ type 233.53 1,000 psi gauge – 1/4″ npt lm stainless steel the rugged construction of wika type 23x.53 stainless steel gauges provides resistance to the most corrosive media and environments. These gauges feature 316 stainless steel wetted parts and 304 stainless steel case and crimped ring, and can be liquid filled in the field. specifications: connection location: lower mount wetted parts: stainless steel case material: stainless steel case filling: liquid window type: crimped window construction: polycarbonate compatibility u.s. Gauge: 500l, 551l, 552l