Remove your faucet and attach one end of the line cleaning attachment. Attach the other end to a garden hose or stationary tub hose. engage your coupler into the open position and place it in a bucket. Turn on the water. You've just backflushed the entire system!
You can also attach this to a hand pump or container with cleanser and backflush the solution through.
The Adapter barb is 3/8'' which allows a 5/16'' I.D. tubing to be attached to the barb.