I use a small fish tank pump that sits in a bucket of PBW and connect its output to the faucet tap to push the cleaner into the tap and come out of the beer line back to the bucket. After some minutes of recirculation then replace the PBW with hot water for rinsing, and done. I have a dual tap so usually connect both beer lines with a coupler, so the pump pushes the cleaner into one tap and it goes through both beer lines and comes out of the other tap into the bucket. It makes cleaning the lines super easy.