Nah it's not PVC
.. it's regular black tubing. But things got a little mixed up.. so i was going back and forth to HD today like an idiot trying to find the right pieces and then later find out that they don't have the piece im looking for. So i had to improvise. Since my return is actually 3/4", i used extra 1" tubing from my drain line, and fit that on to the 3/4" bulkhead.. then used a 3/4" - 1" insert coupling adapter and put the 1" hose on to the adapter a long with the 3/4" ID hose that i had previously bought. So it's basically a really messed up return line.. but it'll work. I'll take a picture of it when im done with it.