The GI Cross is used to connect four pipes of equal diameter. It is used in many different situations including HVAC systems, gas lines, water supply systems, air vents, sewerage systems and vacuum systems. We are able to manufacture the GI Cross in a comprehensive range of sizes and specs. As with all our GI products, the GI Cross has been produced using high-precision testing and laboratory tested. It is guaranteed leak-free and is corrosion resistant.