OffBoard Rat Guards


About Rat Guards

Don't Let Pests Be Guests

The OFFBOARD® Rat Guards are spring-loaded devices that easily fit on mooring lines of various sizes to keep rats, mice and other pests off your vessel. They superior rat guards and surpass competitors in design, performance and functionality.

Our rat guards are being used in both military and civilian agencies including the Navy, Coast Guard, NOAA, and maritime museums.


  • Stops vermin (rats, mice, iguanas, etc.) from traversing mooring lines by presenting a uniform barrier.
  • Uses adjustable inserts for the shield opening from 1/2 in. to 2.5 inches to support five different mooring line sizes.
  • Made of Polypropylene with stainless steel components. Uses our patented spring door that opens and closes easily making installation and removal easy and ideal.
  • Does not damage mooring lines but firmly grips it, staying in place.
  • Can be inserted or removed on a mooring line that is in use.
  • Will remain perpendicular to the mooring line even when it's in the water. It stays closed and in place.
  • Can be locked to prevent theft in an unattended environment.
  • Can be used in both fresh and salt water environments.
  • They will not dent or bend with repeated use.
  • It will also float if dropped in the water.
  • They are inexpensive!
  • They are flat and light weight and can be stored safely and conveniently in our fitted Tote Bags.

OFFBOARD® Rat Guards

10 Inch OffBoard® Rat Guard

10 Inch OffBoard Rat Guard

Used on any mooring lines or utility cables that are 3/8 inch in diameter. 


15 Inch OffBoard® Rat Guard

15 Inch OffBoard Rat Guard

Perfect for houseboats and boats over 26' long using mooring lines or utility cables that are ½ inch to 1 inch in diameter.  (white or black).

All 15" Rat Guards ordered after August 2017 are equipped with the new type of inserts.


17 Inch OffBoard® Rat Guard

17 Inch OffBoard Rat Guard

Designed for larger motor yachts, boats or ships over 100 feet in length with mooring lines up to 2.5" in diameter. (white or black)


15 Inch OffBoard® Upgrade Kit

15 Inch OffBoard Upgrade Kit

Four inserts that allow our customers to use 5/8”, 3/4", 7/8" and 1" lines (white or black).

If your inserts are worn or fall out purchase the upgrade kit.

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