Our contractor left in the middle of the shower job and we noticed that our shower leaks into the wall when the shower valve is completely shut off. When looking for the source of the leak, I noticed that the leak stops when the valve is slightly open.
The water leaks from the joint between the pipe in the wall and the shower head pipe. I noticed that the contractor did not use the PFTE tape when connecting the shower head pipe to the pipe in the wall.
I am not 100% sure about the model, but the valve looks like this.
Do I need to replace the shower valve to fix the leak or is it because the contractor did not use the PFTE tape when connecting the shower head ?