Perko 0540DPG99A Cap, O-Ring and Retainer for 1-1/2 Inch Angled Neck Vented Fuel Fills - Gas

The Perko 0540DPG99A is a replacement cap, O-ring, and retainer assembly for 1-1/2 inch angled neck vented fuel fills on gasoline-powered boats. It replaces the original Perko cap on this style of fill, restoring a secure, corrosion-resistant closure over the fuel fill opening. The cap itself is chrome-plated bronze, mounted to a black plastic body, with a stainless steel beaded chain tethering the cap to the fill so it cannot be dropped or lost overboard during fueling. Built into the cap assembly is an integral tank vent equipped with a flame arrestor and an anti-surge valve, helping manage vapor venting from the tank while reducing the risk of flame entering through the vent path and limiting fuel surge out of the vent during rough water or fast fills. A deck plate key is included, sized to turn the cap for removal and installation. The complete assembly weighs 0.46 pounds and ships in a 10 x 5 x 1 inch package. Because the fill hardware is exposed to salt air, fuel, and repeated handling, the chrome-plated bronze and stainless steel chain are chosen for corrosion resistance over painted or plastic-only alternatives. This part is intended as a direct replacement for boat owners whose existing 1-1/2 inch angled neck vented gas fill cap has become worn, cracked, seized, or lost, restoring the fill to factory-original fit and function without changing the deck plate or the mounting hardware underneath.

Specifications

• Brand: Perko
• Manufacturer Part Number: 0540DPG99A
• Product Type: Vented Fuel Fill Cap, O-Ring and Retainer
• Fitment: 1-1/2 Inch Angled Neck Vented Fuel Fills, Gas
• Cap Material: Chrome Plated Bronze
• Body Material: Black Plastic
• Chain Material: Stainless Steel Beaded Chain
• Vent Features: Integral Tank Vent with Flame Arrestor and Anti-Surge Valve
• Included Components: Deck Plate Key
• Color: Black
• Item Dimensions: 10 x 5 x 1 inches
• Weight: 0.46 pounds
• Closure Type: Twist-On

Frequently Asked Questions

What does the Perko 0540DPG99A cap fit? It is sized for 1-1/2 inch angled neck vented fuel fills on gasoline-powered boats, replacing the factory Perko cap on that fill style.

Is this a genuine Perko part or an aftermarket copy? The 0540DPG99A carries an OEM Equivalent Part Number of 0540DPG99A, meaning it is the same part number as the original factory cap rather than a generic aftermarket substitute.

What materials make up the cap assembly? The 0540DPG99A cap itself is chrome-plated bronze, attached to a black plastic body by a stainless steel beaded chain.

Does the cap include a vent? Yes, the 0540DPG99A has an integral tank vent built into the cap assembly, complete with a flame arrestor and an anti-surge valve.

What is included in the box? The 0540DPG99A package includes the chrome-plated cap, the black plastic body with O-ring, the stainless steel beaded chain, and a deck plate key for removing the fill.

How much does the 0540DPG99A weigh? The complete cap, O-ring, and retainer assembly weighs 0.46 pounds.

What are the dimensions of the packaged cap assembly? The 0540DPG99A ships in a 10 x 5 x 1 inch package.

What color is the cap? The body of the 0540DPG99A is black, paired with a chrome-plated bronze cap top.

How does the cap attach or close on the fill? The 0540DPG99A uses a twist-on closure, and the stainless steel beaded chain keeps the cap tethered to the fill so it cannot be lost overboard.

Is fuel type a consideration with this cap? Yes, the 0540DPG99A is designed for gas (gasoline) vented fuel fills, not diesel.

Why does a vented fuel fill need a flame arrestor? The integral vent on the 0540DPG99A includes a flame arrestor to help block flame from entering the fuel tank through the vent path, along with an anti-surge valve to limit fuel surge out of the vent.

Can the 0540DPG99A be used on any deck fill, or just this fill type? It is built specifically for 1-1/2 inch angled neck vented fuel fills and serves as a direct replacement for the original Perko cap on that fitting.