I am installing a new Hansgrohe shower. It came with this part https://www.hansgrohe-usa.com/articledetail-showerpipe-basic-set-16181181 that I decided to connect to this https://www.amazon.com/dp/B002UQ1ZBA - They are both 1/2 NPT and I am using teflon tape.
I originally tighten the fitting by hand and then turned back on the water, and it started to leak slightly around the teflon tape [see picture]. I then tightened it with a pair of pliers as hard as I could but water continues to drip, one drop per 30 sec. What am I doing wrong? I am worried to break the fitting if I continue to tighten with a tool.

