[TAPMAN]

I recently ran into the same situation. There is a flow reversal valve that MM sells, but an easier way to flush through the pumps, is to reverse the inlet and outlet nipples on the pumps on the line that you pumping into. There is a locking clip that holds the nipples in place. Unlock the clips, reverse the nipples on pump#1,3,5. Pump into faucet#1, jumper, jumper ,out faucet #6. Make sure to turn off air supply to pumps first.You may want to bring a bucket back to the walk in, As you pull the nipples out of the pumps, there will be some beer(not a real lot) that comes out, Hopefully you have easy access to the bottom of the pumps. The first few times it will be a pain the , but once you get used to it , it won't be too bad. Good luck Tapman