I have used the Malpasi filters and pressure regulators on several of my cars, and they have always done what they say. In my present classic car, a Malpassi pressure regulator is standard fitment, but in this case, after 36 years it was starting to leak air, and so was sluggish in its operation. This unit was a straight swap out, with a minor pressure adjustment, and now all is well again - hopefully for another 36 years!