Made in the US to imperial (inches) standards.

Threaded screw in lids with rubber O-rings to seal out water. The Viking Port's unique design integrates the O-Ring into the rim, making it nearly impossible for the O-Ring to fall out.

Use the following chart to determine the appropriate APS part number for your Inspection Port or Bag requirement.

The Fat Bag (pictured left) for the Viking Inspection port is a great option for storing items while sailing. Made of a sturdy nylon material, the Fat Bag fits into the appropriately sized Viking inspection port without ruining the watertight seal of the port. Large enough to fit a spray top, bottle of water, or other similarly sized items.

The Cat Bag (not pictured) is similar to the Fat Bag, but narrower in diameter, reducing its volume. It's great for keeping personal items such as keys, wallets and spare parts in a safe place while you are sailing.

Comes in three diameters: 4", 5" and 6" - this measurement is taken by obtaining the diameter of the threaded portion from the inspection port's lid.

NOTE: The Fat Bag and Cat Bag are NOT waterproof, and may not be appropriate for items susceptible to water damage.

Made in England to metric (millimeters) standards.

Threaded screw-in lid with rubber O-ring combines to seal out water - the O-ring fits snuggly around the cover to create a tight seal. If you already have an existing RWO inspection port on your boat and are in need of a replacement, these ports will fit.

Use the following chart to determine the appropriate APS part number for your inspection port requirement:

The Barnie Bag for the RWO Screw Thread Inspection Port is a great option for storing items while sailing. Made from random bright colors, with a gusset top and drawstring, the Barnie bag is perfect to provide good dry secure storage for drinks, food, tools, valuables or any other necessity.

Comes in three diameters: 4", 5" and 6" (not available for the 8" port) - this measurement is taken by obtaining the diameter of the threaded portion from the inspection port's lid.

These bags will not work with the RWO Economy Inspection Port.

NOTE: The Barnie Bag is NOT waterproof, and may not be appropriate for items susceptible to water damage.

Holt Allen Inspection Ports are available in two styles: with or without an O-Ring seal.

The non O-Ring style (HA137, HA237) features a fast closing, non-watertight bayonet action cover that will also operate even when fitted to a slightly curved surface.

The O-Ring version of the Holt Allen Inspection Port (HA337, HA537, HA637) also operates with a fast closing bayonet action cover, but with extra protection to help keep water out. Please note that the O-Ring is not included with the inspection ports; rather, they are a separate item.