A precipitation tube and a precipitation tube bundle for a wet electrostatic precipitator, in particular for separating dusts, gases, and/or aerosols from exhaust gases are disclosed. The precipitation tube is designed as a modular tube system. It has at least two wall parts which each form a periphery segment of an inner periphery of the precipitation tube and are connected to each other so as to form at least part of the inner circumference of the precipitation tube. The modular tube system may include at least two wall parts, which each form a length segment of the precipitation tube and are connected to each other so as to form at least part of the length of the precipitation tube. The precipitation tube bundle is modular and includes a supporting structure on which a plurality of precipitation tubes are detachably held by connecting elements.