Perko chrome-plated fuel cap assembly for 1-1/2" angled-neck vented gas fills with O-ring and retainer chain

Perko 0540DPG99A is a chrome-plated replacement fuel cap assembly with O-ring, retainer, and vented flame-arrestor designed for 1-1/2" angled-neck gas fills.

This aftermarket Perko cap set restores a secure, vented fill point on boats and vessels using a 1-1/2" angled-neck gas fill. It pairs a durable chrome-plated bronze cap and a black plastic body with an integral vent and anti-surge valve to manage pressure while helping reduce fuel spillage during filling and movement. The package includes a beaded stainless steel retainment chain and a deck plate key to install and remove the cap.

How does this cap maintain ventilation while preventing spills?

The Perko cap features an integral tank vent combined with a flame arrestor and an anti-surge valve. This arrangement allows tank vapors to vent safely while the anti-surge mechanism helps minimize fuel loss during rough conditions or sudden movement.

• Integral vent for controlled pressure relief
• Flame arrestor reduces ignition risk from external sources
• Anti-surge valve limits fuel ejection during motion
• O-ring ensures a tighter seal to limit leakage

What materials and components are included, and why do they matter?

The assembly combines metal and engineered plastic so you get corrosion resistance and a secure thread fit. The chrome-plated bronze cap offers a durable, attractive finish; the black plastic body resists degradation from fuel and weather; and the stainless steel chain resists rust where retainment is critical.

• Chrome-plated bronze cap for corrosion resistance and long life
• Black plastic body that tolerates fuel exposure
• Stainless steel beaded chain to keep the cap attached to the deck
• Deck plate key included for secure installation and removal

Will this cap fit my fuel fill—what should I check before ordering?

This Perko assembly is made for 1-1/2" angled-neck vented fills used with gasoline. Before purchasing, confirm your fill neck is the angled 1-1/2" size and that your application requires a vented cap. Always cross-reference Perko part numbers or your vessel manufacturer’s recommendations for compatibility.

• Designed specifically for 1-1/2" angled-neck vented gas fills
• Check existing neck dimensions and vent requirements first
• Compare Perko part number to original equipment when possible
• Not for non-vented or differently sized fill necks

How do I install and maintain the Perko 0540DPG99A assembly?

Installation is straightforward with the included deck plate key: remove the old cap and replace the assembly, making sure the O-ring seats correctly. Routine maintenance includes inspecting the O-ring, cleaning the flame arrestor openings, and checking the chain and fasteners for corrosion.

• Use included deck plate key to tighten and loosen cap
• Seat O-ring firmly to maintain a fuel-tight seal
• Clean flame arrestor and vent passages periodically
• Replace O-ring or chain if wear or corrosion appears

Who is this for: The Perko 0540DPG99A is suited for boat owners, marine mechanics, and anyone needing a direct-fit replacement for a 1-1/2" angled-neck vented gasoline fill. Choose this assembly when you want a durable, vented cap with a flame arrestor, anti-surge valve, and retainment chain to restore safe, code-conscious fuel access on small to medium vessels.