1/4" NPT Mini filter-reducer piggyback duo is recommended when space is a problem. Duo offers most of the same features as the full size units, plus the space saving convenience of 20 micron screw in mini filter. Preassembled with 0-160 PSI gauge, this piggyback mini FR duo includes a metal bowl. Ideal for use in compact air flow applications. Maximum pressure of 150 PSI and Maximum SCFM of 20.