Shopping from Canada? 
Go to Defender Canada!
Lewmar
Lewmar New Standard Replacement Portlight Seal
Item: #872935 | Part Number: Not Selected$40.99 - $47.99
Description
The Lewmar New Standard Replacement Portlight Seal restores a watertight seal to Lewmar opening ports (1997–present), stopping leaks and improving cabin comfort. Supplied as a complete loop, it's an easy, effective way to refresh aging portlight seals and maintain reliable weather protection.
Lewmar New Standard Replacement Portlight Seal Item # 872935
Description
This Portlight Replacement Seal provides a watertight seal and stops leaks on Lewmar opening ports (produced from 1997 to present).
Features:
- Standard replacement portlight seal
- Designed for use on Lewmar opening ports (produced from 1997 to present)
- Supplied as a complete loop
- Measure port outside frame dimensions
Specifications:
- Size 0 Port Outside Frame Dimensions: 12 11/16" x 6 15/16"
- Size 1RE Port Outside Frame Dimensions: 14 7/16" x 7 1/2"
- Size 4L and 4R Port Outside Frame Dimensions: 27 7/8" x 7 11-16"
- Size 7RE Port Outside Frame Dimensions: 16 3/4" x 7 1/2"
- Size 1 Port Outside Frame Dimensions: 14 7/16" x 7 1/2"
- Size 2 Port Outside Frame Dimensions: 16 3/4" x 6 15/16"
- Size 3 Port Outside Frame Dimensions: 17 11/16" x 7 1/2"
- Size 4 Port Outside Frame Dimensions: 25 7/16" x 7 1/2"
- Size 5 Port Outside Frame Dimensions: 17 11/16" x 10 3/8"
Included:
- Seal
- Instructions
Note: Portlights on boats manufactured between 1996 and 1999 may have the Old Style or New Style ports. The handles and dimensions are different. See the Attached Guides to identify your port.
Part Numbers for Lewmar New Standard Replacement Portlight Seal
Reviews
Rated 1 out of
5
by
David from
Not even close
Did.all my research, I believe this is what they believe was the correct gasket for the portlights. Problem is that the profile is way to thick so the window doesn't close. Limited data and installation instructions.
Date published: 2024-09-29
Rated 1 out of
5
by
Anonymous from
Not interior gasket
This is not the interior window gasket. Wish Defender provided more detail on the gasket.
Date published: 2026-06-08
Rated 1 out of
5
by
LesG from
Doesn't fit
Despite being the recommended replacement seal, no amount of forcing will get the lip of the seal into the grove of the window frame. It's far too big. Completely useless.
Date published: 2025-08-27
Rated 5 out of
5
by
Jessica from
Easy to install
Easy to install, fits great. It was a little difficult closing the newly installed port light the first couple of times.
Date published: 2025-07-25
Rated 5 out of
5
by
SV Ziggy from
Good Product
I found these gaskets to be great so far. You have to make sure the channel is totally clean of any old adhesive before installing. It will be hard to close the windows for a week or two, but they get easier when the gasket start to conform to the window. These type of gaskets have to be really tight to keep the water out.
Date published: 2025-02-17
Rated 1 out of
5
by
BLUEFOOT9 from
Lewmar impossible
Imposible to determine the right size with the Lewmar seals
Date published: 2024-06-17
Questions
Replaces Lewmar 19898900 port light seal?
Portlights on boats manufactured between 1996 and 1999 may have the Old Style or New Style ports. The handles and dimensions are different. See the Attached Guides to identify your port.
Lewmar New Standard Portlight Seal Replacement Instructions
Lewmar Standard Portlight Measurements
https://defender.com/assets/pdf/lewmar/900438.pdf
https://defender.com/assets/pdf/lewmar/lewmar_portlight_dims.pdf
Date published: 2024-01-03