Can you post a photo here? OR at the Plumbing Forum? For starters, turn off the water supply, then unscrew the handles. Probably worn out old washers in there. You can take one of those old washers to the hardware store and get some that are the same size. -Babka

Not sure what the T would be for. Every one i've installed it was a straight run from the top of the valve to the shower head. The valve should have two outlets, one for the shower, the other for the tub spout.HTH

Oh, here are some Delta pages that might help: Customer support: http://www.deltafaucet.com/wps/portal/deltacom/kcxml/04_Sj9SPykssy0xPLMnMz0vM0Y_QjzKLN7SMN_YOBskB2ebxYY76kaiCAfFmTkhivh75uan6Qfre-gH6BbmhEeWOjooAhcuc0w!!/delta/base64xml/L3dJdyEvd0ZNQUFzQUMvNElVRS82XzE3XzdFUQ!! Faucets: http://www.deltafaucet.com/wps/portal/deltacom/kcxml/04_Sj9SPykssy0xPLMnMz0vM0Y_QjzKLN7SMN_byA8kB2ebxYY76kaiCAfFmTkhivh75uan6Qfre-gH6BbmhEeWOjooAO4Rzow!!/delta/base64xml/L3dJdyEvd0ZNQUFzQUMvNElVRS82XzE5XzNLUw!!?spf_strutsAction=%2fviewProductSearchResults.do&task=DfcProductSearchResults&prdArea=Bath%3ARomanTubWhirlpoolBath&prdFinish=All&prdCollection=All&prdHoles=All&prdMaxPrice=---&prdMinPrice=---

I’m not sure where your leak is coming from, I just wanted to tell our experience so you can gauge whether it might be a possibility in your case. One of our guest bathrooms had a leak that we originally assumed was from the shower. We hadn’t lived in the house for very long, and we hadn’t even used that shower yet when my sister came to visit. She stepped out of the shower and realized that water was squeezing up between the tiles when she stepped on them. Naturally, she informed us. My hubby had the entire bathroom completely gutted in half an hour! (It was a small bathroom with a Fiberglass shower, the tiles popped up like toast out of a toaster, and he’s just a beast... lol!) we see evidence of long term damage and provide my sister with another bathroom to use for the remainder of the visit. We didn’t start the bathroom remodel immediately, and when we did start it was slow going. We were very fortunate because we had barely started the remodel when we got another weather front move in with a whole lot of moisture... (It has been snowing a lot during her visit) and that’s when we realized the bathroom was leaking from another source! Hubby again ripped up the bathroom, and this time ripped out part of the wall that is on the exterior and that’s when we realized the leak was coming from outside. It took us a bit to figure out but we finally determined (with outside help) that it was because that wall was directly against an exterior chimney that had not been flashed properly. We left that bathroom unfinished for quite a while while we fixed the chimney problem, and waited for some more really good rain storms to make sure it was indeed dry before we finished our bathroom remodel. We were just fortunate that we have a lot of other bathrooms and this was just a guest bathroom. Anyways, I hope your issue isn’t something like that!