Robinair FLCK-1 Filter Conversion Kit for Promax Recovery and Recycling Units Replaces the obsolete swivel fitting (p/n MF1275) used on earlier Promax units Allows the use of standard Male/Male Filter Kit includes 4 inch long hose, male/male inline filter, and adapter Coupler nuts feature deep knurling for a positive grip that enables quick finger-tightening Hose ends feature a strong six-sided crimp that provides a secure, reliable connection between the hose and barb - even at maximum pressure