Plumbers tool bag designed by a group of gas engineers. Monument went up and down the country to work with local plumbing and heating engineers to design the perfect bag for gas engineers. They built a team of plumbers and called them monument masters. These plumbers worked with monument to design the perfect tool case for plumbers and gas engineers. Outer pocket for the manometer. Pockets inside for the flue gas analyser and printer. Strong and waterproof rugged bag. Monument masters gas engineer tool case. Perfect tool bag for plumbers.