I've been replacing the rusty metal tanks with plastic ones, and thinking that every time the ballcock goes up and down it flexes the plastic, which could break after a few years.
The one I put in a few days ago overflowed last night.
I could move the holes lower. any advice please?
http://www.wiki.diyfaq.org.uk/index.php?title=Plumbing_Articles doesnt help with cold water plumbing