Milton 1/4" NPT Filter, Regulator & Lubricator Trio. 1/4" NPT Deluxe FRL trio is a filter, regulator and lubricator all in one. The filter has an automatic overnight drain, the regulator is the relieving type and the lubricator is drip style. This pre-assembled unit has polycarbonate bowls with metal bowl guards and includes a gauge. Offers a Maximum of 150 PSI and 16 SCFM. 40 micron filter element.