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well think your right...have put the cold feed direct from the filter, but while it was all off also took the cold feed off at toilet tap, and blew throught the pipe...did manage it but it took a bit of puff. Flow is a bit better, but not as I had in old van. I also see that they have taken a T connection then a elbow from the main pipe to  feed to the toilet taps then another at the tap itself..kitchen has another t piece before the taps,...have no idea though how to remove these connectors,, and unsure how to join another bit of pipe to the ones already there as they are a plastic pipe,....would a bigger bore over that work ?

and where to buy y piece

Went searching for figures on how much elbows and tees reduce flow and as far as gas is concerned it's measured as an extra half metre of pipe per fitting. The logic being the overall pipe length is increased and its the friction in long runs of pipe that is the real restriction to flow. For pipe have you tried CAK Tanks ? They specialise in motorhome/caravan water systems.

As an aside, the search led me to a similar discussion on an AMD 'overclocking' forum?, this is where people try and get AMD computer processors to run faster than designed...a lot lot faster!!. They are also concerned about elbows slowing flow rates in their water cooling systems which they use to stop the processor melting!!!

Interesting for me as I was doing the same with early AMD chips many years ago...wish I'd thought about water cooling!