Hi, The ball valve in our cold water header tank seems to be causing some knocking and generally seems to be due for a change (intermittent overflow for example). In my local B&Q there are two varieties of valve: high and low pressure. My Collin's DIY manual gives no guidance on this subject so I'm wondering if there is some decisive factor in which to use. The house is a normal two storey semi with a good mains pressure. Thanks in advance for any advice, Peter.
- posted
18 years ago