These replacement Trevi valves which are half metal and half plastic are completely useless. They fail within 12 months and break apart when you try to remove them to replace them, leaving the plastic part inside the shower. I bought 6 of these and put them in 3 showers but they were a total nightmare to remove to replace when they failed prematurely. DO NOT BUY THESE! please only buy the all brass ones as these brass/plastic ones will give you many hours of pain as you try to extract the pieces from the shower!