Comet Pressure Equalizer

[ksagara2]

Does anyone know where I can buy a  plastic bottle "Comet Pressure Equalizer"  connected to the water pump under the sink?  It has a couple of pinholes with water leak. I need to buy a replacement.
Many thanks for your help

Kenichi

[Nigel]

They are widely available in the UK from caravan suppliers.

If you don't mind doing a bit of plumbing, you can replace it with any pressure vessel: such as an accumulator.