The 3M Aqua-Pure 56084-01 replaces the following discontinued encapsulated (self contained) RO membrane modules: 55571-02 (18 GPD with 36" flow control tube), and 55571-03.  The encapsulated membrane also replaces other 22-33 GPD TFC modules such as 66-43101, 66-43019, Aqua-Pure AP5500RM TFC reverse osmosis membrane used with the Aqua-Pure AP-RO5500 reverse osmosis system.  
Features:

• 25 Gallons per day
  
• Compatible with AP-RO5500 & SP-RO5000 systems
  
• Alternate Part Numbers: 70020019231, 55571-02, 55571-03, 66-43101, 66-43019

Requires 12" Red SFC Flow Control Tube which inserts in the elbow fitting that is off-centered on the end with 2 elbow fittings  (the end with the single fitting is the feed from the prefilter).
Note: This membrane is discontinued. To replace please order the 3M Aqua-Pure AP5500RM Compatible TFC Membrane.