{"product_id":"lewmar-size-3-opening-portlight-smoke-lens-screen","title":"Lewmar Size 3 Opening Portlight, Smoke Acrylic Lens with Flyscreen","description":"\u003cp class=\"nvn-hero\"\u003eThe Lewmar Size 3 opening portlight brings real airflow and daylight into a stuffy cabin. Smoke gray acrylic lens, silver aluminum frame, white interior trim, and a flyscreen so you can leave it cracked at anchor without the bugs. A clip handle dogs it down tight when the weather turns.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eLewmar's been building ports and hatches since 1946, and the Size 3 opening portlight is one of those parts that quietly does its job for decades. It's an opening port, so it hinges out for real airflow through the cabin, then dogs down tight with a clip handle when the weather turns. If you've got a hot berth or a galley that traps cooking heat, this is the kind of upgrade you notice on the very first muggy night at anchor.\u003c\/p\u003e\n\u003cp\u003eThe lens is smoke gray acrylic. That tint does two things. It knocks down glare and cabin heat during the day, and it gives you a bit of privacy at the dock without blacking out the light entirely. The frame is silver anodized aluminum, low-profile and clean against a white cabin side. On the inside you get a white ABS trim ring that finishes the opening off nicely, so you're not staring at a raw cutout edge from your bunk.\u003c\/p\u003e\n\u003cp\u003eVentilation is the whole point of an opening port, and Lewmar includes a flyscreen so you can leave it cracked at anchor without inviting every mosquito in the anchorage below deck. The screen sits in the interior trim and pops in and out for cleaning.\u003c\/p\u003e\n\u003cp\u003eLet's talk fit, because that's where these live or die. The cut-out is 16-7\/8 inches wide by 6-3\/4 inches tall. Overall the port measures 17-11\/16 inches wide by 7-1\/2 inches tall, so the frame gives you a little under an inch of trim all the way around the hole. Before you cut anything, hold the port up to the cabin side and trace it. And measure twice. On a curved cabin side the trick is keeping the cutout from ovaling at the corners, because a port that's forced into a slightly wrong shape will weep at the corners no matter how much sealant you throw at it.\u003c\/p\u003e\n\u003cp\u003eThe kit comes with twelve M5 by 25mm screws and the clip handle. We tell every customer the same thing on install: pre-drill your screw holes so you don't strip the aluminum frame, bed the whole port in a good marine sealant, and don't crank the fasteners down like you're torquing a lug nut. Overtightening is the number one reason these start to drip six months later. It bows the frame just enough to break the seal. Snug and even is what you want, and let the sealant do the sealing, not the screw pressure.\u003c\/p\u003e\n\u003cp\u003eOne thing to check before you order: if you're mounting into a cored cabin side or deck, you'll want the core properly sealed and a backing arrangement so you're not compressing bare core when you tighten down. It's a standard bit of marine carpentry, but it matters for a part that has to stay watertight for years.\u003c\/p\u003e\n\u003cp\u003eThe clip handle is worth a mention. It's a simple, positive latch. You swing the port closed and the clip pulls it in against the gasket for a solid seal. No fiddly knobs to lose overboard, and no tools needed to open or close it from inside. When you're heading out and the forecast turns, you can close every port on the boat in under a minute.\u003c\/p\u003e\n\u003cp\u003eWho's this for? Sailboat and trawler owners replacing a tired, crazed old port, or anyone adding ventilation to a berth, head, or galley that needs air. It's a Size 3, a mid-size port that fits a huge range of production boats. If you're matching it to existing Lewmar ports on the boat, the trim profile stays consistent across the line, so a full set looks like it came from the factory.\u003c\/p\u003e\n\u003cp\u003eMaintenance is easy. Rinse the acrylic with fresh water and a soft cloth, and skip the harsh solvents and ammonia glass cleaners, because those haze acrylic over time. A dedicated plastic polish keeps the lens clear for years. Give the gasket a wipe now and then and a little silicone treatment so it stays supple and keeps sealing. Do that and a Lewmar port will outlast a lot of the boat around it.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eOpening design hinges out for real cabin ventilation and dogs down tight with the clip handle\u003c\/li\u003e\n  \u003cli\u003eSmoke gray acrylic lens cuts glare and cabin heat while keeping daytime privacy\u003c\/li\u003e\n  \u003cli\u003eSilver anodized aluminum frame, low-profile and corrosion-resistant for life on the water\u003c\/li\u003e\n  \u003cli\u003eWhite ABS interior trim ring finishes the opening cleanly from inside the cabin\u003c\/li\u003e\n  \u003cli\u003eRemovable flyscreen keeps insects out while the port is cracked at anchor\u003c\/li\u003e\n  \u003cli\u003eCut-out dimensions 16-7\/8 in. wide by 6-3\/4 in. tall fit a wide range of production boats\u003c\/li\u003e\n  \u003cli\u003eOverall size 17-11\/16 in. wide by 7-1\/2 in. tall gives full trim coverage around the cutout\u003c\/li\u003e\n  \u003cli\u003eIncludes twelve M5 by 25mm mounting screws and the clip handle\u003c\/li\u003e\n  \u003cli\u003eClip handle latch seals the port against the gasket with no tools needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Lewmar reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this an opening portlight or a fixed one?\u003c\/summary\u003e\n    \u003cp\u003eIt's an opening port. It hinges outward for ventilation and dogs down tight with the clip handle when you want it sealed. That's what makes it a good choice for a berth, head, or galley that needs airflow.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size hole do I cut for this port?\u003c\/summary\u003e\n    \u003cp\u003eThe cut-out is 16-7\/8 inches wide by 6-3\/4 inches tall. The overall port measures 17-11\/16 inches wide by 7-1\/2 inches tall, so the frame overlaps the hole by a little under an inch all the way around.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it come with a bug screen?\u003c\/summary\u003e\n    \u003cp\u003eYes. Lewmar includes a flyscreen that sits in the interior trim, so you can leave the port cracked at anchor without letting insects below. It pops in and out for cleaning.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat hardware is in the box?\u003c\/summary\u003e\n    \u003cp\u003eYou get twelve M5 by 25mm screws and the clip handle. You'll want to supply your own marine bedding sealant for the install.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I keep it from leaking?\u003c\/summary\u003e\n    \u003cp\u003ePre-drill the screw holes so you don't strip the aluminum frame, bed the whole port in a quality marine sealant, and snug the fasteners evenly without overtightening. Overtightening bows the frame and is the most common cause of drips down the road.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I install it on a cored cabin side or deck?\u003c\/summary\u003e\n    \u003cp\u003eYou can, but seal the core properly and use a backing arrangement so you're not compressing bare core when you tighten the port. That keeps the gelcoat from cracking and the port watertight for the long haul.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat is the lens made of, and will it stay clear?\u003c\/summary\u003e\n    \u003cp\u003eThe lens is smoke gray acrylic. Rinse it with fresh water and a soft cloth and use a plastic-safe polish. Skip ammonia glass cleaners and harsh solvents, which haze acrylic over time.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the frame and interior trim like?\u003c\/summary\u003e\n    \u003cp\u003eThe frame is silver anodized aluminum for a low-profile look and corrosion resistance. Inside, a white ABS trim ring covers the raw cutout edge for a finished appearance from the cabin.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill it match my other Lewmar ports?\u003c\/summary\u003e\n    \u003cp\u003eIf you already run Lewmar ports, the trim profile stays consistent across the range, so a matching set looks factory. This is the Size 3, a mid-size port common on many production boats.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eOpening Portlight, Size 3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eLewmar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e393320200\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e743683120275\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003ctd\u003eOpening Portlight\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003ctd\u003eSize 3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCut-Out Dimensions\u003c\/th\u003e\n\u003ctd\u003e16-7\/8 in. Width x 6-3\/4 in. Height\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOverall Dimensions\u003c\/th\u003e\n\u003ctd\u003e17-11\/16 in. Width x 5\/32 in. Depth x 7-1\/2 in. Height\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFrame Material\u003c\/th\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFrame Color\u003c\/th\u003e\n\u003ctd\u003eSilver\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eLens Material\u003c\/th\u003e\n\u003ctd\u003eAcrylic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eLens Tint\u003c\/th\u003e\n\u003ctd\u003eGray (Smoke)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eInterior Trim\u003c\/th\u003e\n\u003ctd\u003eWhite ABS Plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFlyscreen\u003c\/th\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eHandle\u003c\/th\u003e\n\u003ctd\u003eClip Handle\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMounting Hardware\u003c\/th\u003e\n\u003ctd\u003eTwelve M5 x 25 Screws\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this an opening portlight or a fixed one?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's an opening port. It hinges outward for ventilation and dogs down tight with the clip handle when you want it sealed. That's what makes it a good choice for a berth, head, or galley that needs airflow.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What size hole do I cut for this port?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The cut-out is 16-7\/8 inches wide by 6-3\/4 inches tall. The overall port measures 17-11\/16 inches wide by 7-1\/2 inches tall, so the frame overlaps the hole by a little under an inch all the way around.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it come with a bug screen?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. Lewmar includes a flyscreen that sits in the interior trim, so you can leave the port cracked at anchor without letting insects below. It pops in and out for cleaning.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What hardware is in the box?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"You get twelve M5 by 25mm screws and the clip handle. You'll want to supply your own marine bedding sealant for the install.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I keep it from leaking?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Pre-drill the screw holes so you don't strip the aluminum frame, bed the whole port in a quality marine sealant, and snug the fasteners evenly without overtightening. Overtightening bows the frame and is the most common cause of drips down the road.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I install it on a cored cabin side or deck?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"You can, but seal the core properly and use a backing arrangement so you're not compressing bare core when you tighten the port. That keeps the gelcoat from cracking and the port watertight for the long haul.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What is the lens made of, and will it stay clear?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The lens is smoke gray acrylic. Rinse it with fresh water and a soft cloth and use a plastic-safe polish. Skip ammonia glass cleaners and harsh solvents, which haze acrylic over time.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the frame and interior trim like?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The frame is silver anodized aluminum for a low-profile look and corrosion resistance. Inside, a white ABS trim ring covers the raw cutout edge for a finished appearance from the cabin.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will it match my other Lewmar ports?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"If you already run Lewmar ports, the trim profile stays consistent across the range, so a matching set looks factory. This is the Size 3, a mid-size port common on many production boats.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Lewmar","offers":[{"title":"Default Title","offer_id":44787289882717,"sku":"2007165","price":393.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_c3350828-32f0-4f28-baf4-3e7373c83b59.jpg?v=1784993059","url":"https:\/\/nvnmarine.com\/products\/lewmar-size-3-opening-portlight-smoke-lens-screen","provider":"NVN Marine","version":"1.0","type":"link"}