The 1/2" push 'n' connect water hammer arrestor tee by Waterline is the fastest and easiest way to help eliminate water pipe banging. Push 'n' connect water hammer arrestors are designed to provide a maintenance free continuous protection system against the destructive forces generated by the sudden stop of water flowing in the water distribution system. The push 'n' connect connectors allow the arrestor to be installed in seconds; even on wet pipe.