Erpingham Above Ground Installation (AGI) is another of the Feeder 2 block valve sites which form a key part of the UK Gas National Transmission System (NTS), which transfers gas from Bacton Gas Terminal. As part of their ‘National AGI Renovation Campaign’, which commenced in January 2018, National Grid decided to replace some of the older gas assets on Erpingham AGI as they were reaching the end of their working life.