The new Derby range of GRP rings innovated by Aqua S&TS has proven to be a massive success. After a few years of design and testing the GRP Derby range of catch-pit rings was approved for use by Network Rail. Since then they have become the engineer’s friend by improving installation times and reducing labour on site. This is due to the Derby’s incredible light weight but robust construction, recently proven by independent test house ‘EXOVA’ and was proved to withstand a UDL of 390KN. This combined with the 16kg weight enables the Derby frame to blow the traditional 71kg concrete frame out of the picture.