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Hatch Gasket, Lewmar Coastline 20-3/16" x 20-3/16", <-1999

Part #: Z4431
Gasket for Lewmar 20-3/16" x 20-3/16" Coastline hatch. Seals the lid to the deck flange.
For Lewmar Coastline hatches manufactured from 1991 through 1999 (Catalina used this series of hatch as early as 1991 and this size starting in 1998. It is likely they used it even earlier. It is also likely Catalina installed this Coastline hatch inventory in boats until sometime in 2000). This hatch can be identified by a single (not split) frame that cannot be disassembled in two halves. The gasket has a trapezoidal cross section and is glued onto the bottom of the aluminum frame surrounding the lens.

Known Usage:
• Catalina 320, 2 per boat ('98-'99)
• Catalina 34, 2 per boat ('98-'99)
• Catalina 36, 2 per boat ('98-'99)
• Catalina 42, 3 per 2 cabin ('98-'99), 4 per 3 cabin ('98-'99)
• Catalina 470, 2 per boat ('91-'98)

There may be other instances where this hatch is used. It is also possible that not every boat described above used this hatch. Please use the dimensions above and the photos below to verify which hatch is actually installed on your boat.
• Outside of deck flange: 512mm x 512mm (about 20-316" x 20-3/16")
• Cutout: 442mm x 442mm (about 17-3/8" x 17-3/8")
• Height off of deck: 25mm (about 1")

Please note that these hatches are built in England and made to metric system standard dimensions. All Imperial equivalents are approximate.

Lens (not including the gasket)
• Lens thickness: 10mm (about 3/8")
1) Since Lewmar is a British company, all of their products are metric. The fractional dimensions provided are the nearest equivalents.

2) "Coastline" model hatches typically have the name "Coastline" stamped into the lens. Use this characteristic for verification as other Lewmar hatch models use different gaskets.ewmar Size 44 coastline