Supply and installation of Pol-4 40mm Polair Air Pipe Ring-Main. A mixture of compression and electrofusion fittings were used to keep the pipe following the other services. All stainless steel and poly fittings and tube were used to be of a food grade standard including isolation valves on each point. Various push fit fittings and tube were used for air actuated valves and solenoids on machines controls and distribution panels. Different levels of micron filters both pre and post-dryer were used to make the air of a food grade quality.