5mm speed fit too 1/2" hose/tap

evening all.
was wondering if there is such a thing.

ive got a reverse osmosis filter system that uses all 5mm speedfit piping and conections.

for the feed to the system at the mo ment i only have one of those self piercing type connectors that taps into a hose. problem is it a bit naff and im presuming it lowering the pressure alot and i need all i can get for the sytem to work efficiently.

so i could with a adater that could take 5mm speedfit one end and 1/2" garden hose the other.

is there anything about or and combo of bits i could use?
thanks
ian

reverse osmosis uses 1/4" lldpe tubing and fitting which is 6.35mm.

ok then i stand corrected.

is there something about then that can fit this size?
thanks
ian

useally what i do on fridges, reverse osmosis etc.

if you t off your cold mains then fit a washing machine isolation valve.
then a 3/4" to 1/4" LLDPE fitting.

the code for the fitting is john guest pt n0 CI320816S.