How to size up a replacement radiator bleed valve??

27 Jan 2009
Reaction score
United Kingdom
The bleed valve on my radiator snapped off recently. I've drained the radiator down and am ready to replace the valve. However when I looked in B&Q they didn't have the right size. I then ordered one online which I thought was the correct size - I measured the thread diameter which is approx 6mm. However when I recieved the part today its too big - thread approx 11mm diameter. Did they send the wrong one or am I measuring it wrong? Thanks for the help!
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Thanks, any ideas where the best place to get one from would be?
Any ideas?? The valve is approx 11mm high, thread is 6mm dia and the head 11mm diameter

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