"EricP" wrote in message
...
The permanent magnet or the electronic ones.
For the 15mm mains water inlet

Do they really work and which is best, magnet or plugged in one?
They all seem to cost a bomb but I have heard some good stories from
users both domestic and semi industrial. I thought they were a joke.

I have an Aqua Dial electronic one. It works. Best get one with a no
quibble return if it doesn't work. Give it 6 months.