Plastic Clamshell Vent Covers



  • These classic clamshell vent covers are designed to cover existing vents or to route cables or wires through a hole and shield thru-hull openings from excess water spray
  • Crafted from durable marine grade plastic, these economical and attractive vent covers are built to withstand the elements. They are resistant to UV rays, saltwater, and harsh weather conditions, providing long-lasting protection for your boat's vents and thru-hull wiring

These super-strong molded clamshells are an economical and attractive alternative for metal clamshells. These clam shells are great for routing cables or wires through a hole or for covering thru-hull openings to shield water spray. They are also useful for covering small vent holes for ventilation. These vents are UV and weather resistant. Available in two popular sizes.

OEM/Bulk Product Name Distributor Packaged
CS-1 Clamshell vent, Opening 9/16" H x 1 7/8" W, Base 2"x2"- Black CS-1-DP
CS-2 Clamshell vent, Opening 9/16" H x 1 7/8" W, Base 2"x2"- White CS-2-DP
CSS-1 Clamshell vent, Opening 7/16" H x 7/8" W, Base 1 5/8"x1 1/2"- Black CSS-1-DP
CSS-2 Clamshell vent, Opening 7/16" H x 7/8" W, Base 1 5/8"x1 1/2"- White CSS-2-DP

OEM - Bulk: 50/Box

Packaged: 12/Box


  • Colors: White, Black
  • Sizes: 7/16" H x 7/8" W, 9/16" H x 1 7/8" W
  • Material: Marine Grade Plastic

Customer Reviews

Based on 4 reviews
Curt R.
Clamshell for wiring

Worked perfectly, even lines up with old hole great!!

James B.
replaced an old one

I got the wrong size the first time, because the dimensions were confusing and the part numbering system. Same undimensioned picture for both. Before they got back to me, I took a chance on the other ones, since there were only two, and go the right size. These have a countersunk hole design and are very thin to start with, so if they get overtightened from taking off and on, they tend to crack at the hole edge. Whomever rigged the boat put this in and so I had to match to not drill more holes (or buy a new console.)

They offered to pay the shipping, but could not refund on an order. So I got a set of big ones, I can't use, and twice the cost, but next to nothing. But I got them...

Michael M.
Just as described. Shipped quickly

Easy install does exactly what I need to run cables.

Vincent D.

Easy fast shipping

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