The down comer on my main bathroom sink corroded and had small drip to it. I thought the down comer was part of the trap assembly package that you buy, but it was not. The very knowledgeable staff at Riteway informed me i only need one piece that was sold separately. I decided since it was apart and i was at the store already I might as well replace the trap as it was starting also to show signs of wear. The staff showed me that their trap was a heavier gage than the existing and likely heavier than the big box stores, he was honest and says he charges a bit more.
If i would have visited the box store I likely would have ended up without the down comer piece and would have had to make a second trip.
It also feels good to support the local small business guy nice to see businesses survive on the ave.