Lewmar bug screens are sold by hatch or portlight line and exact size code, never as a universal fit — a Low Profile Size 30 flyscreen will not fit a Size 44 or an Ocean-series hatch — and MAURIPRO carries genuine Lewmar flyscreens, clip-on portlight screens, and Vetus mosquito screens sized to match. Confirm your hatch's line and size code first, and the correct mesh drops straight into the trim you already have.
This is written for the cruiser (~30-45 ft) whose hatch or portlight screen has torn, gone brittle, or gone missing entirely, and who wants to let the air back in without ordering the wrong mesh twice. The screen is one of six spare-part categories sold separately on a Lewmar hatch (seal, hinge, lid, handle, trim, and flyscreen), and — like the others — it is profiled and sized to a specific hatch or portlight line, not sold as a one-size mesh.
Get the line and size right and the screen clips or hinges straight in with no drilling. Get it wrong — order a Low Profile flyscreen for an Ocean hatch, or a hatch screen for a portlight — and it simply will not seat in the frame.
Lewmar & Vetus hatch screens at a glance
| Hatch / portlight line | Screen type | Example (size varies) | Price |
|---|---|---|---|
| Lewmar Low Profile hatch | Alloy-framed flyscreen, fits inside the existing plastic trim ring | Low Profile Size 30 Flyscreen | $72.95 |
| Lewmar Ocean hatch | Combined trim & alloy-framed screen kit | Ocean Hatch Size 20 Trimkit | $126.00 |
| Lewmar Atlantic portlight | Clip-on flyscreen (fits over the open portlight) | Atlantic Port Size 40 Clip Flyscreen | $40.99 |
| Lewmar Standard (New) portlight | Clip-on flyscreen | Standard Port Size 3 Flyscreen | $40.99 |
| Older sewn-screen hatches | Retrofit kit — converts a sewn screen edge to a hinged clip mount | Flyscreen Hinge Retro Kit, White | $23.99 |
| Vetus Planus hatch | Mosquito screen, alloy-framed | Vetus Mosquito Screen (Planus 3023) | $77.95 |
| Vetus Altus / Magnus hatch | Combined hatch trim & mosquito screen kit | Vetus Trim / Mosquito Screen 4242 | $181.00 |
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Do all Lewmar hatches come with a bug screen?
Most Lewmar hatch lines ship with a flyscreen as standard, but the screen is sold and stocked as its own spare — independent of the seal, hinges, or lid — specifically because it is the part most likely to need replacing on its own. Lewmar builds the flyscreen as an alloy-framed mesh insert sized to snap or hinge into the existing plastic trim ring, so a torn or sun-brittle screen is a direct swap, not a reason to replace the trim or the hatch. The Ocean series is the exception worth flagging: Lewmar sells its Ocean hatch screen bundled into a combined trim-and-screen kit rather than as a bare mesh insert, which is also why an Ocean trimkit costs more than a Low Profile flyscreen alone.
How do I know which flyscreen size my hatch needs?
Match the hatch line first, then the numeric size code — in that order, the same sequence used for any other Lewmar hatch spare. Lewmar's Low Profile flyscreens alone span at least six size codes we stock (10, 20, 30, 41, 44, and 54), and each one is a different physical mesh footprint; a screen ordered by "Low Profile" alone, without the size code, is a guess. The fastest way to confirm both is the hot-stamped identification code on the hatch's acrylic lens — standard on Lewmar hatches built after 1997 — which ties directly back to the hatch's line and size in Lewmar's own reference. If the lens code has worn away, measuring the hatch's cut-out dimensions against Lewmar's published profile specs gets you to the same answer.
What's the difference between a flyscreen and a trim kit with a screen?
A standalone flyscreen replaces only the mesh insert and drops into a trim ring that is already in good shape; a combined trimkit replaces the interior plastic surround and the screen together, which is the right call when the trim itself is cracked, faded, or missing — not just the mesh. On the Ocean line specifically, Lewmar doesn't sell the screen as a bare insert at all — it only comes packaged with the trim, which is reflected in the price difference between a $72.95 Low Profile flyscreen and a $126.00 Ocean trimkit that includes both parts. If you're not sure which you need, inspect the plastic ring around the screen opening first: sound trim plus torn mesh means a flyscreen; cracked or discolored trim means the combined kit.
Do portlights use a different screen than hatches?
Yes — portlight flyscreens are a separate part family from hatch flyscreens, built to clip over the outside of an open portlight rather than seat inside a hatch's trim ring. Lewmar's Atlantic and Standard (New) portlight lines each use their own clip-on flyscreen, sized to the portlight's size code the same way hatch screens are sized to the hatch's code — an Atlantic Size 40 screen and a Standard Size 3 screen are not interchangeable even though both are portlight flyscreens. One trade-off worth knowing before you order: on some Lewmar portlight lines, a clip-on flyscreen fitted in place prevents the portlight from being closed, so it's best suited to a portlight you leave open at anchor rather than one you regularly dog down underway.
Can I upgrade an older Lewmar hatch to a hinged flyscreen?
If your hatch currently uses an older sewn-edge screen rather than a hinged, clip-mounted one, Lewmar's Flyscreen Hinge Retro Kit converts the mounting point without replacing the whole trim assembly. The kit is a small hardware retrofit — a hinge clip that attaches to the existing screen edge — so it's worth checking before assuming a worn or awkward-to-remove sewn screen means a full trim-kit replacement. It's also the least expensive item in this lineup, since it upgrades the mounting hardware only, not the mesh or frame itself.
What if my hatch isn't a Lewmar?
Vetus builds its hatch screens the same way Lewmar does — matched to a specific hatch line and size, not sold universally — which means the sizing discipline in this guide applies whether you're standing at a Lewmar hatch or a Vetus one. Vetus's Planus line uses a standalone alloy-framed mosquito screen, similar in concept to a Lewmar Low Profile flyscreen. Its Altus, Magnus, and FGH lines instead sell the screen bundled with the hatch trim — sized to that specific hatch's cut-out (the 4242, 4747, 6363, and D520 size codes we stock are not interchangeable with each other) — which is why those combined kits run $181–$265 rather than the $70–$80 range of a standalone screen. If you don't yet know whether your hatch is a Lewmar or a Vetus, check the hatch frame or lens for the manufacturer's name molded or stamped into the plastic before ordering either brand's parts.
Expert notes
From our parts desk: the single most common screen mis-order is a customer quoting only the hatch's profile name ("Low Profile") without the size code — every profile spans multiple sizes, and the screen is cut to that size, not the profile in general. Always pull the size code off the lens stamp or the original hatch paperwork before ordering.
On boats that see a lot of at-anchor time in buggy anchorages, we also see the screen wear out well before the seal or hinges — UV and repeated flexing break down the mesh and its stitched or framed edge faster than the hardware around it, so a torn screen on an otherwise sound hatch is a very normal single-part fix, not a sign the whole hatch needs attention.
Common mistakes
- Ordering by profile name alone. "Low Profile" or "Ocean" isn't enough — the numeric size code determines the actual mesh footprint, and two different sizes in the same profile are not interchangeable.
- Assuming a hatch screen fits a portlight, or vice versa. These are two separate part families with different mounting methods (trim-ring insert vs. exterior clip-on) even on the same boat.
- Buying a standalone screen for a line that only sells the combined trim kit. Ocean-series hatches and most Vetus Altus/Magnus sizes bundle the screen with the trim — check availability before assuming a bare-mesh option exists.
- Guessing the brand. Lewmar and Vetus screens are not cross-compatible even where cut-out sizes look similar; confirm the manufacturer stamped on the frame or lens first.
Frequently asked questions
Which bug screen fits my Lewmar hatch?
It depends on the hatch's line (Low Profile, Ocean, and others) and its numeric size code, found as a hot-stamped code on the acrylic lens on hatches built after 1997. MAURIPRO stocks genuine Lewmar flyscreens sized to each line and code.
Do Lewmar hatches come with a screen included?
Most lines ship with one as standard, but it's sold and replaced as its own spare, independent of the seal, hinges, lid, or trim — a torn screen doesn't require replacing any other part of the hatch.
Is a portlight flyscreen the same part as a hatch flyscreen?
No. Portlight flyscreens clip over the outside of the open portlight; hatch flyscreens seat inside the hatch's trim ring. Each is sized to its own line and size code and the two are not interchangeable.
Can I buy just the screen without replacing the whole trim kit?
On most Lewmar lines, yes — a standalone flyscreen is sold separately from the trim. The Ocean line is an exception: Lewmar bundles its screen into a combined trim-and-screen kit rather than selling it as a bare insert.
Do Vetus hatches use the same screens as Lewmar?
No. Vetus and Lewmar screens are sized and profiled to their own hatch lines and are not cross-compatible, even at a similar overall size. Confirm the manufacturer before ordering.
My old hatch has a sewn-in screen with no hinge clip — can I upgrade it?
Yes. Lewmar's Flyscreen Hinge Retro Kit converts a sewn-edge screen mount to a hinged, clip-mounted one without replacing the full trim assembly.
Recommended gear
Lewmar Low Profile Hatch Size 30 Flyscreen — the direct replacement for a torn or missing screen on a sound Low Profile trim ring.
Lewmar Ocean Hatch Size 20 Trimkit — combined trim and screen for the Ocean line, which doesn't sell the screen separately.
Lewmar Atlantic Port Size 40 Clip Flyscreen — the exterior clip-on screen for Atlantic portlights, a different part family from hatch screens.
Vetus Mosquito Screen (Planus 3023) — the standalone alloy-framed screen for Vetus Planus hatches.
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