Wika 2.5 type 233.55 3,000 psi/bar gauge – 1/4 npt lbm stainless steel the type 233.55 lbm is specifically designed and manufactured to exact panel builder requirements. With exclusive features, it is ideal when used for panel mount gauges in the oil and gas, refinery, petrochemical, and food & beverage industries. specifications: connection location: lower back mount wetted parts: stainless steel case material: stainless steel case filling: liquid window type: crimped window construction: laminated safety glass