722 do I use HP or LP Cartridge?

I have a very old (over 25 years old) 722 which is fed from a normal low pressure (header tank in the loft) system but has a smal,l flow controlled, shower pump on the feed side. boosting hot and cold. I think the system was an LP system as it only had the pump added 15 years ago. The shower is splendid but is now dripping from the control knob area. I think it is simplest to buy a new cartridge, if so should I buy an HP or an LP one?



I changed the cartridge once before about 12 years ago and the old one had a very corroded spiral so it definitely needed changing. So a new cartridge is again the answer i think.
Asked 8 years ago by Martin
If the pump is no more than a 2 bar then a LP cartridge should work fine.

Answered 8 years ago by Anonymous

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