They are designed to be installed on the roof of the tank as a manhole or access cover, for atmospheric and pressure tanks.
Available in الفولاذ المقاوم للصدأ AISI 304, AISI316 with exterior opening for الفولاذ المقاوم للصدأ tanks. Designed for the chemical, food, wine, pharmaceutical, reactors, PED pressure tanks. They are available with multiple joints with FDA certification in rubber, EPDM, Neoprene, NBR, Viton or Silicone.