Replacing an older Lewmar deck hatch should be straightforward — provided you know exactly which hatch you have. The complication is that Lewmar has produced several hatch ranges, sizes and base configurations over the years, and the model number is not always immediately obvious on an older installation.
The Aqua Marine Storm Deck Hatch range has been developed as a high-quality, cost-effective alternative for some of the most common Lewmar Ocean Hatch sizes used on UK yachts, motor cruisers and powerboats. Available in Size 30, Size 50 and Size 60, with both flat and flanged base options, the range makes identifying a suitable replacement considerably easier.
In this guide, we’ll explain the different hatch configurations, show the original Lewmar product codes alongside the Aqua Marine equivalents, and explain what you should measure before ordering.
The closest comparison for the Aqua Marine Storm Hatch range is the Lewmar Ocean Hatch. The Ocean range has been installed on thousands of sailing yachts and motor boats and has historically been offered in a choice of sizes and lower-frame configurations.
Aqua Marine currently covers three of the most commonly encountered sizes — 30, 50 and 60 — and provides both a flat-base and flanged-base version of each.
🔎 Important Compatibility Check
A Lewmar product number is an excellent starting point for identifying your hatch, but always check the actual deck aperture and base type before ordering. Lewmar has manufactured several hatch families over many years, so matching on “Size 30”, “Size 50” or “Size 60” alone is not sufficient.
If you know the original Lewmar product or ordering number, the table below provides a quick cross-reference to the corresponding Aqua Marine Storm Hatch.
| Lewmar Range | Size | Base Type | Lewmar Product Code | Aqua Marine Equivalent |
|---|---|---|---|---|
| Ocean Hatch | 30 | Flat Base | 39630050 | Aqua Marine Size 30 – Flat Base |
| Ocean Hatch | 30 | 25mm Flanged Base | 39630070 | Aqua Marine Size 30 – Flanged Base |
| Ocean Hatch | 50 | Flat Base | 39650050 | Aqua Marine Size 50 – Flat Base |
| Ocean Hatch | 50 | 25mm Flanged Base | 39650070 | Aqua Marine Size 50 – Flanged Base |
| Ocean Hatch | 60 | Flat Base | 39660050 | Aqua Marine Size 60 – Flat Base |
| Ocean Hatch | 60 | 25mm Flanged Base | 39660070 | Aqua Marine Size 60 – Flanged Base |
⚠️ Check Before Ordering
Lewmar has produced different hatch ranges and revisions over many years. The product codes above relate to Lewmar Ocean Hatch configurations. If your hatch identification is unclear, measure the existing deck aperture and contact us before ordering. We can help confirm which Aqua Marine hatch is appropriate.
This is one of the most important distinctions when replacing a Lewmar Ocean Hatch. Two hatches can both be described as “Size 50”, for example, while having different lower-frame configurations.
A flat base hatch is designed to sit directly onto a suitably flat deck or moulded mounting surface. It is commonly used where the boatbuilder has already created the necessary deck structure beneath the hatch.
A flanged base incorporates a lower frame that extends into the deck opening. On the equivalent Lewmar Ocean Hatch, this is a 25mm lower-frame profile. The Aqua Marine range therefore provides separate flat and flanged versions so that the replacement can be selected to suit the existing installation.
💡 Don’t Choose by Size Alone
If you are replacing an existing hatch, identify whether you currently have a flat or flanged lower frame as well as the hatch size. Matching both gives you the best chance of a straightforward replacement.
The Aqua Marine Size 30 Storm Deck Hatch is available in both flat and flanged versions and provides an alternative for the corresponding Size 30 Lewmar Ocean Hatch configurations.
It is well suited to sailing yachts, motor cruisers and leisure boats where a compact but substantial opening hatch is required. Features include a tinted lid, marine-grade construction, corrosion-resistant components, a watertight seal and a lockable ventilation position.
The Aqua Marine Size 50 Storm Deck Hatch provides considerably more opening area and is a popular choice for larger cabin and foredeck applications.
Owners looking to replace Lewmar Ocean Hatch references 39650050 or 39650070 should start with the Aqua Marine Size 50 flat or flanged version respectively, while still confirming the aperture before installation.
The Aqua Marine Size 60 Storm Deck Hatch is the largest size currently available in the range. Its square format makes it particularly suitable for larger foredeck, saloon and cabin installations where generous access, ventilation and natural light are required.
The corresponding Lewmar Ocean Hatch references are 39660050 for the flat-base configuration and 39660070 for the 25mm flanged version.
Replacing a complete deck hatch can be expensive, particularly on an older yacht where several hatches may require attention at the same time. Aqua Marine Storm Hatches have been developed to provide a more competitively priced alternative without treating the hatch as a budget component.
Size 30, 50 and 60 · Flat and flanged base options · Fast UK delivery
Before buying a replacement, first look for identification markings on your existing Lewmar hatch. Depending on its age, information may be marked on the acrylic, frame or an identification label. If you can find a product number beginning 396, compare it with the Ocean Hatch references in the table above.
If no identification is visible, the next step is measurement. Measure the actual opening in the deck rather than simply measuring the outside of the hatch lid.
The most important dimensions when replacing any deck hatch are the length and width of the existing deck cutout. External frame dimensions can differ between manufacturers while still being designed around a compatible opening.
Measure the aperture carefully in millimetres and check whether your installation requires a flat or flanged lower frame. If there is any uncertainty, send the measurements and photographs of the existing hatch to our team before ordering.
📐 Replacement Rule
Identify the range → check the product number → confirm the size → identify flat or flanged base → measure the deck aperture. Never rely on the size number alone.
Send us your Lewmar product number, aperture dimensions and a photograph of the existing hatch and we’ll help identify the correct Aqua Marine replacement.
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