Manufactured from PVC coated polyester base cloth, which gives high abrasion and UV resistance, the standard capacity range is from 500 to 550,000 Litres. Each tank has various options of inlet and outlet valves. All tanks are fitted with pressure relief valve clusters and included for helium, a PVC funnel cone with 4" fitting for gas diversion from the cluster. All tanks are manufactured and certificated in accordance with the current EN ISO 9001:2000 quality standard .