Dorf mixer tap still leaking after new cartridge

[Lyn]

I have a Dorf mixer tap that is leaking from the body. A plumber has replaced the cartridge but it is still leaking when the tap is turned off.
Do these taps have other parts that need replacing? Suggestions would be most welcome.
Regards, Lyn

 

[oz-plumber]

Have you had a pressure reducing valve installed at the water meter or under the tap.
Most taps are rated at 500 kPa.
Depending on where you are, pressures in the mains can get well over 1000 kPa.

You had better check this out because, if the tap blows, insurance will come out and check the pressure to the tap.
If it's over the rated pressure of the tap, you will have difficulty getting a claim through