Restricting water pressure to RO unit

[Cyntax]

Hello,

Just finished installing my Kent maxxima RO/DI unit. I have a pressure gauge on the input line and when I turn the water on full it reads about 100psi. The manual for the unit says it should be 65psi.

I went to Home depot to look for a regulator but they only have these giant things for 1.5" pipe. Seems alittle bit extreme for what I wanted it for.

Has anyone else run into this problem? Any idea's where I could get a pressure regulator that will fit 1/4" plastic pipe?

Thanks!