Grout Tubes are made of 100% recycled plastic and are available in 50mm and 70mm diameter and available in lengths of 100mm to 700mm that interconnect. Plastic Grout Tubes are used in both precast and tilt-up applications for grouting starter bars or dowels that connect concrete elements together. 90 degree angles are also available and magnetic locating caps and plastic end caps. The system is easy to use and saves time.