was founded in 3 Aug 1972 by Sankichi Muroi during Japan’s economic growth when engineers and architects faced growing challenges in managing vibrations and noise with only 1 bellow rubber flexible joint available in Japan. Recognising these needs, TOZEN developed the world’s first high quality 2 bellows rubber flexible joint which quickly gained recognition. As cities grew taller and more complex, TOZEN’s products became critical in preventing the damage caused by seismic activity, vibrations and water system stresses.