Wika 2.5 type 213.53 1,000 psi gauge – 1/4 npt cbm stainless steel wika type 21x.53 gauges feature a stainless steel case for protection in harsh environments. The o-ring seal around the connection makes this gauge field liquid fillable. When filled, the 213.53 is excellent for high vibration and pulsation applications. specifications: connection location: center back mount wetted parts: brass copper alloy case material: stainless steel case filling: liquid window type: standard window construction: polycarbonate compatibility u.s. Gauge: 535l, 545l, 546l, 555l, 556l, 559l ashcroft: 3005hl