No-hub couplings of metal for pipes; No-hub pipe couplings primarily of metal and elastomeric material; Clamps of metal and structural component parts thereof for sealing, and fastening tubes, pipes, and fittings; Couplings of metal and structural component parts thereof for sealing, and fastening tubes, pipes, and fittings; Shield of metal specially adapted for pipe couplings for sealing and fastening, tubes, pipes, and fittings.