This Laars replacement part kit is specifically designed for use with CB and HWG boiler models. The kit includes a set of washers and springs, essential components that ensure the proper functioning of these boilers. Washers, typically flat discs with a hole in the center, are used to distribute the load of a threaded fastener, such as a screw or nut. Springs, on the other hand, are elastic objects used to store mechanical energy. In boilers, they play a crucial role in regulating pressure and maintaining system balance. This kit provides these necessary parts for routine maintenance or repair needs.