I purchased this unit to replace a Regulator that had no filter or lubricator. It works nicely and the filter dumps any moisture collected at shutoff. The reason I gave this unit 4 stars instead of 5 is the o-ring on the oiler cannister. It requires several attempts to seat it correctly, each time requiring purging of my small shop system and refilling with pressurized air to test for leaks. It seems that the o-ring is just the right size without stretching and tends to slip out of its groove in the cannister when installing even using a little oil as lube to slip it into place. The fourth time was the charm though, and it's been holding well since then..
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