It depends on who manufactured the ports. If they came from Beckson you can call them at 203-333-1412. On my boat they are 4X10 opening drain ports. Beckson has a new type of dog called a Cam Latch they sell them for 8.00 per set. I replaced all the dogs on my boat with the new cam latch. Much easier and faster to batton down the ports. Bomar makes the Elliptical Ports in my boat. There number is 603-826-5791. They don't sell the cam latch their dog are the stands screw type latch. I replaced five of the dogs in my boat. I wish I new about the cam latch before I purchased these dogs. I would have converted those port dogs. Best to call Beckson and see if they could work in other ports.
Beckson also has a web site at www.beckson.com. I put the cam dogs on my ports and they work great -- much more convenient than the screw on ones (Would they be screw dogs? Which would make the appropriate fastening terminology "doggie style.") If I was planning to do ocean passages I might be concerned about the strength of the cam latches, which have plastic threads.
Your portholes are Gray marine ports, they are made by bomar, JSI of St. Pete Fla. sells all the details you need, the right threaded knobs, shafts, pins, port glass, screens etc. if you buy bexton, they may not be the right thread or size.
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