Parker/Watts QIX Modular FRL Systems
  Parker/Watts QIX Modular FRL Systems fasten together with pins.  QIX is short for "Quick Insert eXchange" because of the ability to quickly reconfigure port sizes and/or components, thus reducing downtime. QIX systems offer sizes from 1/4" to 1".
Included in this line of Watts products are:
Particulate Filters, Coalescing Filters, Regulators, Lubricators, Integral Filter/Regulators, Combination Units, Valves, & all of the components required to modularize a complete system with any combination of parts.