Stuck or leaky valves must be repaired or replaced. Diseased heart valves that have become abnormally narrow or abnormally leaky may require surgery. The class initially suffered from major technical problems, such as leaky roofs and failing electronics. To fix the leaky bucket, he needs straw. It was known for being overcrowded, leaky and draughty. The cause of the leaky capillaries is usually not known. A diode is equivalent to a one-way check valve with a slightly leaky valve seat. Two different methods of applying this leaky bucket analogy are described in the literature. The Cauldron Shop is very near to the entrance from The Leaky Cauldron. The leaky pipeline also applies in other fields. Other factors may also dissipate the proton gradient creating an apparently leaky mitochondria. They return to Britain and stay at the Leaky Cauldron with Harry and Hermione. Thus the life expectancy of a timing belt is lowered in hot or leaky engines. Other leaky vaccines are commonly used in agriculture. Dr. Leaky, the project's investor, discovers them and demands that they be kicked out.