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These foam seals are specially designed, with an outer diameter of 45mm, an inner diameter of 31mm and a thickness of 3mm, making them ideal for stationary and sealed flower circulation pumps. In order to prevent leakage of central heating circulating pump, this foam seal is essential. It firmly fixes the circulation pump and hose in the hole, while preventing water from flowing back through the opening. These seals are made of EPDM and have excellent durability and flexibility. They are waterproof and weather resistant, and can withstand outdoor conditions. Foam seals are light in weight and easy to install. Just slide them into the central heating circulating pump to achieve safe and waterproof installation. There are 10 gaskets in the packaging.