My handheld (stand-alone) shower head constantly drips, so I bought another unit that would not fit. After the third unit, the instructions said I needed a vacuum breaker. I'm not even sure if a vacuum breaker or backflow valve will stop the leak.
One guy said I need a new faucet valve, and another said "no". Also, I have a metal ball on the pipe from the wall, so I found an adapter to hopefully use if I can figure out this vacuum breaker problem. The guys in hardware & home improvement stores give me mixed answers. The short question, I guess, is can the absence of a backflow valve or vacuum breaker cause a leak?