leading manufacturer of rubber sealing gaskets for round ducts and fittings, Extrusion from black EPDM rubber and Vulcanize jointed to rings. Used for sealing in ventilation system fittings. *Single or dual extrusion. *Different hardness available (50shore A ~ 85shore A). *Size 80, 100, 125, 150, 180, 200, 250, 300, 400,450, 630,...up to 1250 *Anti-friction treatment *Typical shapes(double lip seal) such as F-shape, E-shape, U-shape, T-shape, L-shape, W-shape, TT-shape.