Hi guys, I will at some point have to replace the valve or the vacuum breaker in my toilet. The problem is that water seeps through after flushing. I have been leaving the cassette slightly open so the water runs into the cassette but this means it fills up too often. Could any one recommend the best place to get the spares from. Would it be wise to replace both parts just to be safe as I don't want to pull it apart again in the future.