In 1976 we introduced our first spherical expansion joints, under the name “MASONFLEX”. Although we had higher burst pressures than the other manufacturers, our technical literature still made people aware that Nylon reinforcement had to be derated at higher temperatures. MASONFLEX connectors did not always require control rod protection as the lengths at given pressures were predictable. Leaving a gap in the piping equal to these elongated lengths eliminated the control rods. Running field tests with many acoustical consultants proved the ability of twin sphere connectors to dramatically reduce sound and vibration transmission at blade passage frequency (number of pump blades x rpm).