A piston pump is described for pumping a fluid, comprising at least two cylinders each having a piston which is movable inside the associated cylinder along the longitudinal axis of the cylinder by means of a drive, wherein cylinders are attached to a common pump flange. The active transient suppression apparatus may be embodied in a system for determining a quantity of fuel in a container. The substrate has an upper surface with a first portion and a second portion surrounding the first portion. The playing instruments include at least one identifier that may be read upon being dealt, such as identified and stored on a computer-readable medium before a game.