We discussed with Neoperl and find a proper flow regulator.Under 0.1~0.8Mpa pressure,the flow rate will always be 8L/min±10%.Is that OK?Or you need 7L/min to restrict it under 8L/min?The regulator is put inside the hand shower connector of the hose,in the place of the black washer.
I am sorry that we can't do that test by ourselves.We can only test it in our water test machine and weight the water to calculate the flow rate.I am afraid that such report will not be effective,right?If you need,we can send you 2 regulators for your checking or testing.Since Neoperl is famous and the quality should be assured,and it should be no problem to pass the flow rate test.
Any question,please feel free to contact us.