I have a three handle tub system in which we replaced both the hot and cold stems as well as the diverter. The diverter is utilized by turning the handle clockwise or counterclockwise. When we replaced the diverter we had a problem getting any water coming into the tub though getting it out of the shower was no problem. We took it out and put it back about 5-6 times and finally got enough flow into the tub to decide to quit at that point. Now three months later the water out of the shower is great but when you turn the handle to get water to flow into the tub, a loud banging can be heard in the pipes and no water flows to the tub. Did not put any pipe dope on any seats as I read in another meassage. Please post the answer here if you would like but would you also contact me at my email with your suggestions which might include telling me to contact a qualified plumber.