The O-profile seal is designed for windows that have a groove. Made of thermoplastic elastomer (TPE), which is durable, high quality and fully recyclable. Weatherproofing protects from cold, draft and dampness. Proper seals help to save energy. The seals are waterproof, washable and withstand extreme weather conditions, such as cold (-50 ºC) and hot (+130 ºC). Withstands chemicals but not solvents such as petroleum ether or oils. Before installation, make sure the seal fits the groove by comparing it e.g. to the old seal. Remove the old seal and clean the gap before installation. Part the seals and press the installation arrow on the side of the seal into the groove so that the seal attaches into place. RK seals can be installed at any temperature. Features: Extremely elastic Fully recyclable Lasts up to 15 years Diameter: 8 mm Installation arrow width: 4 mm and depth: 4,7 mm Suitable for 3-6 mm gaps