Atom Module. Replacement for Model: NHC 203-6628. All parts are made to meet or exceed OE specs and quality.Fits Briggs & Stratton engines (except twin cylinders used on lawnmowers, tillers, riders, snow blowers and other power equipment.. This solid state ignition module replaces contact sets and condensers.. The module works on most 2 and 4 cycle gasoline small engines.. Green.