Larry, I haven't a clue, myself, as to why that restrictor is needed.
But in my own experience, the restrictor  must be there. I had to
replace that short pressure hose with the restrictor. I did it with a
hose that had no restrictor. I went through 5 pumps thinking they were
all bad, given the racket they were making, and three of those pumps
were brand new remanufactrure pumps. I sent them all back as bad pumps.
I was totally embarassed when I learned of the fix. Dennis Haynes or
Scott Daniels - can't remember which - told me about  having to have the
restrictor else I would have lots of noise like a bad pump. Turned out
to be true. Lots of noise. Replaced the non-restrictor hose with one
with a restrictor, noise was gone. Just my experience.

John

On 7/10/2012 6:48 PM, Larry Alofs wrote:
> What is the purpose of the restrictor anyway???
>
> Larry A.