The specified capacitor is a CAP CER 18PF 1.5KV C0G/NP0 1812 with an capacitance of 18 pF and a voltage rating of 1500V (1.5kV). It features a ceramic construction with the C0G/NP0 dielectric material, specifically designed for the metric-sized 1812 package, or 4532 in imperial measurements.