Greater strength and higher pressure rating
The heavy duty metal reinforcing rings embedded in the carcass and arch provide additional hoop strength,
increasing the ability to withstand higher external and internal pressure rating

· Fully engineered and field proven
All type 21EP have been engineered and tested in factory to ensure long life time and reliable service.
· Bolt hole lining: Totally rubber lined bolt holes prevent water from penetrating into the carcass through the holes and protect fabric and metal reinforcements in carcass, resulting in longer service life and durability.