I am ordering my own faucets for new home. I checked the valve in shower and it does not look like what Moen has for their shower trim kit T2152. It might have an SH mark but there is not a stamp 2520 2570 2510. This valve has a metal piece to hold the screw vs the brass piece that is shown for new models. Can anyone tell me how old this valve might be and if I should be concerned with having an old cattridge.