Warning Rubber Expansion Joints (REJ) may operate in pipelines, or equipment carrying fluids and/or gases at elevated temperatures and pressures, and may transport hazardous materials. Precautions should be taken to protect personnel in the event of leakage or spray. REJs should only be installed where inspections are possible and should be installed over areas with proper drainage. REJ installations should be conducted by authorized and qualified pipe fitters. If the REJ is to be installed underground, or will be submerged in water, contact General Rubber Corporation (GRC) for specific recommendations.