Recently my dad and I attempted to install a new sink, in hopes of making my office more comfortable. When I bought the house, there was a sink already installed in this “little office” which was built into the garage (not sure of the date). This sink is directly behind a sink installed on the same wall/same pipes outside on the porch. We completed the install, however this is a deep sink, 9inches deep and the last one was similar to a old style bathroom bowl sink like maybe 5-6 inches deep. We had a horrible time just trying to find the correct plumbing fixtures cause the sink came with this weird gray “universal drain” that didn’t fit the current wall configuration since the pipe coming out of the wall was a male thread at 1.5’ in pvc. (Dads words not mine… ) The universal drain connection was only 3/4 inch. However my dad just changed the entire bottom and put the original p-trap (I think that is what it’s called) back on with a new pipe (pvc) coming from the drain part. It’s all sealed, however the sink will not drain quickly if it is filled up. There are no issues on the outer sink. So my dad is stumped as to why it’s not draining quickly. It only seems to happen if there is a lot of water in the sink, then it just sits and drains super slow. Bucket was just to catch leaks if there were any, but all clear there so far.