This fuse link is the direct replacement for many Rheem, Ruud, and Weatherking models. It is commonly used as a safety fuse on electric elements, but may be used in other high temperature applications. This fuse replaces Rheem Ruud Weatherking part numbers 44-20037-01, 44-20037-03, 44-20212-01, 44-20212-02, 8611-5506, 8611-5509, 8611-5518, and 8611-5523.