Hatches & accessories

For hatches and replacement parts, the deck cutout/installation dimensions and the series/generation are crucial. With Lewmar, the embossing/designation on the frame or handle (e.g., “Lewmar Ocean,” “Low Profile”) usually helps. Note the inside dimensions of the cutout, measure the corner radii, and take a photo of the frame, hinges, and latch. This will help you reliably identify gaskets, handles, struts, or acrylic panels.

The deck cutout is the hole in the deck (critical dimension). The outer dimension describes the visible frame/flange. Depending on the manufacturer or series, the installation dimension may refer to the cutout or the installation recommendation, including tolerances. When selecting a hatch, first determine the deck cutout and corner radii, then check the outer dimension/flange to ensure the hatch covers the opening cleanly.

Low Profile refers to a lower profile and fewer “trip hazards”—ideal for modern decks and walkways. Ocean hatches are typically robust and designed for harsher conditions. Flush (flush-mounted/recessed) reduces wind resistance and improves aesthetics, but often requires more precise installation work. Which variant is suitable depends on deck thickness, installation situation, deck traffic (walkways), and desired ventilation.

Often, the gasket, acrylic pane, or latch is worn out. First, check whether the hatch lies flush against the deck and the gasket is not pinched or porous. Gaskets can be replaced on many Lewmar models. If there are hairline cracks or the pane looks “milky,” replacing the acrylic may be advisable. If water is running past the frame onto the deck, the cause is often the frame seal against the deck—in which case the hatch may need to be removed and resealed.

For hatches, elastic, durable sealants are usually used that are compatible with fiberglass and aluminum and do not harden. Avoid aggressive adhesives if the hatch is to remain removable later. Important: Surface must be clean, grease-free, and dry; correct layer thickness; no voids. The manufacturer’s specifications for the hatch and the sealant take precedence.

Typical mistakes include: incorrect cutout (corner radii do not match), sealing layer too thin or too thick, tightening screws “under tension,” lack of underlayment on an uneven deck, and applying sealant to a dirty surface. Result: Leaks, warped frame, or cracked acrylic panel. Careful marking, dry fitting, and even tightening prevent this.

Practical for everyday use are stay-open hinges (hatch stays in position), insect screens & blackout shades (cabin comfort), handles/locks as spare parts, and covers for UV protection in the harbor. For hatch accessories, the rule is: first clarify the series/model, then order—especially with Lewmar, as generations can vary.

Rinse regularly with fresh water, clean hinges and latches, keep gaskets clean, and avoid using harsh cleaners. Clean acrylic panels only with suitable products (otherwise micro-scratches may occur). During winter storage, relieve pressure on gaskets, store with the hatch slightly open if necessary, and protect from UV rays—this significantly extends the life of the gasket and panel.