OEM replacement membrane housing for Ultima Water Systems RO systems. Includes inlet, outlet, and drain tubing, and fittings pre-installed. Includes assortment of fittings to work with most other RO brands. Includes instructions. Does not include membrane element or drain (flow) restrictor. Includes the service manual “How to Service Your Reverse Osmosis System” by Dionicio Porras. Service your RO system like a pro!