Hi again stx. I didn't see any manufacturers mark on them but they sure do look like the Beckson 414. Getting them out was a pain as a previous owner had used a really good adhesive. Rudy at D&R Marine had a reasonable price of about 139.00 each which was on par with anyone else. When I installed them I made split inserts to fill the liner cabin gap that allowed flexing and leaks. In the first photo you can see the notches I put in with a router for the rain drains. That was the only modification I had to make. Then I caulked the edges with Dow Corning 795 silicone sealant that can be purchased from D&R or McMaster Carr with McMaster about half the price, sorry Rudy. Anyway the outer ring is slid over the port on the outside and the silicone secures it when you press it in place. Don't be bashful about how much silicone you use. It cleans right up with mineral spirits or alcohol without damaging the gelcoat. Photo 2 shows the installed port. If you need a link to D&R let me know and I'll post it for you.