In the previous photo I had already cleaned & prepped the cabin sides. I can't stressed enough how important cleaning and prepping the surface of the boat is and cleaning the ports is also equally & very important.
That rag, in the photo, was white when I began cleaning this port. Just because they are new does NOT mean they are clean. I wiped the exterior of the spigot and the hull side of the flange with Acetone and there were plenty of cutting oils and grime to be taken away.
If you don't properly clean the stainless you run the risk of a leak. These ports are filthy when they arrive so please do clean them with a non-oily solvent of your choice.