877 Series,The nickel plated brass body is supplied with a solder tag, fixing nut and washer. Electrical connections are made via two insulated solder terminals.The caps construction is a nickel plated brass screw with polycarbonate transparent fresnel lens. The lens has a flat top with part shielded and part visible sides. An 'O' ring is supplied with each cap which when fitted to the indicator body meets IP64 specifications.,Either a T1 LED or filament lamp with midget flange bases are suitable for use with this indicator, refer to this section.