This pipe is an exit, so not constantly filled with water under pressure. But, the cistern in the loo is always overrunning into the loo a little bit, so there's always a little bit of through flow. Hence constantly dripping.
Next test is to run the sink/flush the loo and see if it gets worse
Strap on boss's are fine, but like everything can leak if not done right and the thing i hate about them is its usually just a push insert as there is nothing to tighten on them
This pipe is an exit, so not constantly filled with water under pressure. But, the cistern in the loo is always overrunning into the loo a little bit, so there's always a little bit of through flow. Hence constantly dripping.
Next test is to run the sink/flush the loo and see if it gets worse