I've had to replace the Kitchen tap mixer and am a bit confused by the supplied and existing valve inserts at the cold and hot water  pipes/flexi hose. Our house uses a low uneven pressure hot water cylinder (low hot water pressure/higher cold water pressure) and according to the tap instructions for this setup it says to just install as supplied, which is the new tap cold flexi-hose has a valve insert which I presume is needed to reduce the cold water pressure? Now, the valve insert that was already attached to the cold pipe under the sink was a simple straight through piece which I have removed. So was that wrong to have been in there in the first place?
Then on the tap hot flexi-hose it has no valve insert and can just simply attach to the existing hot water pipe, which has a valve insert that looks to be a reducing pressure type....is that wrong, I already have low pressure hot water, I don't need it to be even lower do I? Should that have been the straight through valve insert that was connected to the cold water pipe? Should I attach the straight through insert or do both pipes need to have pressure reducing valve inserts? Or are these inserts also stopping muck in the water? Very confusing 
Thanks for any clarification.


Linkback: https://www.plumbers.nz/ask-plumbers-public/2/replacing-kitchen-tap-mixer/2003/