This item include all filters , membrane and a sink faucet adapter.
Please check our picture to make sure the adapter is working for you, or you may need to consider to use different adapter.
We al..
When you have water pressure at 65 PSI, this RO system generate pure water 4 gallons in 60 minutes (100 gallons a day) Below 65 PSI, pure water will be greatly reduced. Below 35 PSI it won't work well..