SET of 4 items for most 5 Stage RO systems ( such NRO5-50 ) = Prefilter, 2nd Prefilter, a Post, an Inline GAC CartridgeIncludes,
as shown in photo:
( 1 ) NP5 5-Micron Sediment ( our PN 23S121005 )
( 2 ) 32-250-125-975 Matrikx Carbon Block ( our PN 633225E12 )( 1 ) NINCF-10-QC In-Line Carbon with Quick Connect fittings ( our PN 54GS10RO-JG )
- 10" Inline GAC post filter 1/4" Quick Connect ( NOTE: after around 2015, the inline has changed to Quick Connect version - Older models used threaded 1/4" version = 54GS10RO ).
Information on Removing and Connecting the Tubing using Quick Connections,
see: How to Use Quick Connect Fittings - Video
Again this is for NR05 - 5 Stage Nelson RO System, and similar systems that use standard sized filters.