.Product Description

Attractive cover for deck drains or ventilation. Works on fiberglass or carpeted surfaces and is great for deck drainage, but also mounts as a vent for compartments and pontoon furniture.

Amazon.com

The item has a 5-5/8" overall diameter. Mounts with 4 screws in a 4" diameter hole. Designed with a flange molded into part to fit into hole so that cut or raw edges are hidden by floor drain for a more efficient, attractive installation.
.Works on fiberglass or carpeted surfaces
.Great for deck drainage
.Mounts as a vet for compartments and pontoon furniture
.4" hole diameter diameter; 5-5/8" overall diameter
.Mounts with four screws

T-H Marine FD-4-DP Floor Drain and Vent Cover - Black, 4"