The 848365-000, also known as the Raychem Rayflate Adapter RDSS-AD-210, is a prefabricated component designed for sealing large diameter ducts. Moulded from a specially formulated rubber, this one-piece adapter works with Raychem RDSS-125 and RDSS-150 duct seals to create a watertight and airtight seal in ducts up to 210 mm in diameter. The range-taking system can accommodate various configurations, such as sealing a 210 mm duct with a cable diameter of 80-120 mm when paired with an RDSS-150 seal. Its tool-free installation, re-enterable design, and unlimited shelf life make it a versatile solution for keeping manholes dry and reducing maintenance downtime in utility networks.