Sometimes when I flush my toilet or when my washing machine fills up with water and shuts off the water, my pipes rattles for a second. I have high water pressure, but for now, if I turn down/reduce the water valve to my toilet(under the toilet) and washing machine reduce the rattling? Sometimes when I flush my toilet or when my washing machine fills up with water and shuts off the water, my pipes rattles for a second. I have high water pressure, but for now, will turn the water value to my toilet(under the toilet) and washing machine reduce the rattling? How much does a licensed plumber charge to change a water pressure regulator in new york city area? Will putting in a water hammer help? How much does a licensed plumber charge to change a water pressure regulator in new york city area?

I'm helping my neighbor redo his 2nd floor master bath. He's removing a tub/shower surround and replacing it with a separate shower and tub. The existing tub had a 1 1/2" drain. My understanding is that a shower requires a 2" drain (from a table in a DIY plumbing book). We were ready to change the size of the drain line to 2" when we found out the old tub had a drain separate from the main stack. It is a 1 1/2" pvc pipe that drops straight down to the basement inside an outer wall. In the basement it ties into a long run of 4" drain. There is no way we can replace the 1 1/2" without some major demo. My questions are - is a 2" drain required by code, if so why the difference between a tub and a shower? Is a 1 1/2" drain adequate for a stand alone shower? The shower base he bought requires a 2" drain, but we can use a reducer.