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FLUIDMASTER MOEL 400UK (SPEC 018) TOILET FILLER VALVE WAS SUPPLIED WITH TWO ALTERNATIVE SHUT OFF SEALS , ONE OF WHICH IS 100 TO 1000 KPA AND THE OTHER ONE, WHICH IS MEANT TO BE LOW PRESSURE. THE NUMBERS ON THE SEALS ARE M 5300 AND M 5394. WHICH IS THE LOW PRESSURE SEAL?

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  • g_ashton Apr 08, 2011

    Didn't directly answer the question and I do have a physics degree, but I guess the suggestion was a simpe practial answer!

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The KPA is a unit of pressure. 1 kPa is approximately the pressure exerted by a 10-g mass resting on a 1-cm2 area. 101.3 kPa = 1 atm = 14.69 psi.
I am not familiar with the 400UK model because it is made for use in England, but it does not matter.
Unless you know what your water pressure is, you still would not know which to use, even if I did know which was the high and which was the low.
So I would start with the one that appears the most rugged.
And if that restricts too much, try the other one.
It can't be that hard to switch.

Posted on Apr 08, 2011

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Replace your toilet fill valve with a fluidmaster 400A

Click here

http://411plumb.com/how-to-replace-your-toilet-fill-valve-with-a-fluidmaster-400a

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