How to identify HP or LP Cartridge

How can I identify whether I have got a Low or High pressure cartridge. Is there a part number on a component somewhere?
Asked 8 years ago by G
On the low pressure cartridge 902.21 - The port holes on the sleeve are square and the holes inside are about 4-5 mm.

The HP cartridge 902.23 - The port holes on the sleeve are a funny shape and are not square and the port holes in the cartridge are about 2-3mm


If you are still unsure you can send us images of your cartridge with the port holes showing and we can advise.

Answered 8 years ago by Anonymous

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