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Ridgisewer Sealing Rings are designed to complement our Ridgisewer Integrally Socketed structured wall pipes and fittings, available in 400-600mm diameters. They are manufactured in accordance with BSI Kitemark license number KM55701 to WIS 4-35-01 and are BBA Approved. Seals are EPDM to EN681Part 1 as standard.