Opening Ports
ScottFrom my experience, you really have two choices: Lewmar or Beckson. Beckson makes the rain drain, which you'll NEED if your cabin trunk slopes [more than 15 degrees] or [at all!].The advantages of the Becksons is that they are still made and have great support and parts. The downside is that some think they don't look as "cool" as the Lewmars, because of their outside thicker trim rings. While Lewmars are still made, they do keep changing sizes.The screens seem to work better on the Becksons.We have eight opening Becksons rain drain 5x12s on our boat and I am very pleased with them. The 1986 C34s had all Becksons. The 1987 and later C34s have six Lewmars in the cabin, and two Becksons in the cockpit to ventilate the aft cabin.Here's a bit longer discussion: http://c34.org/bbs/index.php?topic=2979.0Click on the links in my posts there for even more info.Opening ports are great. Our C25 didn't have them, and we wish she had.The Beckson site also has installation instructions, as I recall. Most portlight vendors have installation manuals on their sites.Stu