RO Housings & Fittings


FRP 4021 - 4" x 21" RO Membrane Housing - DISCONTINUED



  • Fibre-Glass Reinforced Plastic - High Quality RO Housing
  • Strong ABS Single Piece End-Plugs with Simple locking system
  • End-port entry connections - 1/2" Female screw ports - Click here for John Guest Connectors
  • Comes complete with mounting brackets - suitable for static mounting only
  • Tougher, stronger and for use in high pressure applications up to 20 BAR (300psi)
  • Can be used with water up to 66°C
  • To plumb these up you will need 3x 1/2" screw connectors of your choice (we recommend John Guest fittings as above) and 1x 1/2" blanking plug

Connection Instructions

  • The Central Ports at either end can be used as the Pure Water (Permeate) Outlet - The one not being used will need to be blanked off with a 1/2" blanking plug
  • The side (off-centre) port at the top of the housing (the end where the white brine seal is on the membrane) is to be used as the water supply inlet from the pre-filter
  • The side (off-centre) port at the base of the housing is to be used as the waste outlet
  • A suitable Waste valve should be used on the waste outlet tubing
  • All fitting should use PTFE tape before being screwed in to the housing ports
  • All O rings on the housing should be greased with silicone grease before fitting an RO membrane

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You're reviewing: FRP 4021 - 4" x 21" RO Membrane Housing - DISCONTINUED