Overview

The Perko 0126DP0BLK is a non-locking replacement cap for Perko 1313 gas fills. It also matches the cap used on Perko 1399 gas fills, so it is a practical spare when the original cap is missing, worn, or no longer closes the fill cleanly.

It is meant for the Perko gas fill pattern used with 1-1/2 inch fuel hose. On those fills, the deck flange measures 3-1/8 inches across and installs in a 2-1/8 inch mounting hole, which helps when you are checking compatibility on an older boat before ordering.

This is a straightforward service part for boats that already have the correct Perko fill in place. It makes sense when the existing deck hardware is still sound and the only thing that needs replacing is the cap.

Key features

• Non-locking replacement cap for Perko Figure 1313 gas fills
• Also fits Perko Figure 1399 gas fills
• Matches the Perko gas fill pattern used with 1-1/2 inch fuel hose
• Specific Perko fitment rather than a universal deck fill cap
• Useful as a spare when the original cap is lost, damaged, or no longer closes cleanly

Compatibility and fit

Fit is the main thing to verify here. This cap is for the Perko 1313 and 1399 fill style, not for every 1-1/2 inch deck fill. If your boat uses a sealed EPA-style cap or a locking cap assembly, this is a different replacement path.

A quick check at the boat is to compare the existing fill, not just the hose size. Boats with the matching Perko fill usually have the 3-1/8 inch flange and 2-1/8 inch mounting hole pattern noted above.

Installation and use

Replacement is simple once the fill has been identified correctly. Thread the cap onto the existing fill and make sure it seats fully before fueling. On deck fills that see spray, sun, and regular foot traffic, a sound cap matters because it keeps the opening closed between fuel stops.

This is a good match for owners keeping an existing Perko fuel fill in service on fishing boats, cruisers, and sailboats where replacing the full deck fitting is unnecessary.