Our 1980's ITT J Series Argonaut Pump has failed, is the new Argonaut a direct swap?

The new Argonaut pump is not an exact drop-in replacement for the old ITT J Series Argonaut pump from the 1980s. Since the new pump uses different unions and is not threaded like the old one, some alterations will be necessary to make the installation work. This may involve adapting the plumbing connections to match the new pump's fittings, or it might require the assistance of a professional who specializes in pool pump installations. Either way, it will take some extra effort to make this new pump compatible with your existing system, but it should be achievable with the right approach and materials.