Perko 0540 Style Replacement Deck Fill Cap, Chrome Plated Bronze, Vented, O-Ring

Overview

The Perko 0540 Style is a replacement deck fill cap range for Perko 0540, 0541, 0556, and 0557 figure deck fill fittings. It gives boat owners a direct cap replacement path when the original gas, diesel, water, or waste cap is missing, worn, hard to seal, or no longer easy to identify at the deck.

The range uses chrome plated bronze cap construction with an O-ring on the vented cap style, helping maintain the deck fill closure in exposed cockpit, side deck, transom, and fuel-fill locations. The gas, diesel, water, and waste options keep the deck fill label matched to the onboard system, which matters during refueling, water filling, and pump-out service.

Key features

• Replacement cap range for Perko 0540 Style deck fill fittings.
• Used with Perko figure numbers 0540, 0541, 0556, and 0557.
• Cap options cover gas, diesel, water, and waste deck fill identification.
• Chrome plated bronze cap construction on the vented cap style for use in exposed marine deck locations.
• O-ring included on the vented cap style to help maintain a proper closure at the fill.
• Gas replacement cap is not for EPA-compliant sealed fuel systems.
• Waste cap is non-vented and does not include a retainer.

Variants

This product is offered in several deck fill cap configurations for matching the cap marking to the boat system it serves.

The cap type changes by variant: gas, diesel, water, or waste. Compatibility with Perko figure numbers 0540, 0541, 0556, and 0557 is consistent across the range.

• 0540DPG99A: Gas cap. This option is marked for gasoline deck fills and belongs to the vented fuel-fill replacement cap style; it is not for EPA-compliant sealed fuel systems.
• 0540DPD99A: Diesel cap. This option identifies a diesel fill point, which helps reduce the risk of confusing fuel deck fills during service or refueling.
• 0540DPW99A: Water cap. This option identifies the freshwater fill, making it easier to separate potable water service from fuel or waste fittings on deck.
• 0556DP099A: Waste cap. This option identifies the waste deck fill for pump-out service; it is non-vented and does not include a retainer.

Compatibility and fit

Before ordering, match the existing Perko deck fill figure or the original cap style to the 0540 Style replacement range. This is especially important on older boats where gas, diesel, water, and waste fills may look similar from above but use different markings or cap arrangements.

For gasoline systems, confirm that the fill is the compatible vented style and not an EPA-compliant sealed fuel system. A sealed system needs the correct cap type for that fill assembly.

Installation and use

Installation is a straightforward cap replacement when the deck fill body is already compatible and in serviceable condition. Clean the threads and sealing area before fitting the new cap, then tighten it securely without forcing it against damaged threads or debris.

This range suits boat owners replacing a lost cap, refreshing a worn deck fill closure, or restoring clear deck fill identification during maintenance. It is especially useful on boats where fuel, water, and waste fills are close together and the cap marking needs to be easy to recognize.

Maintenance and care

Rinse the cap and surrounding deck fill area after saltwater exposure, then check the sealing surface and O-ring condition during routine maintenance. Replace the cap if it no longer seats correctly, if the marking is hard to read, or if the deck fill closure no longer feels secure.

Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.

Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.

Delivery and tracking
Deliveries are handled by trusted carriers such as USPS, UPS, FedEx, and DHL. Estimated arrival times appear at checkout and depend on your location and the service you choose. These are estimates and can be affected by customs or carrier disruptions. A shipping confirmation with a tracking link is emailed when your order ships, and tracking may take up to 24 hours to update. You can also view tracking in your account.

Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.

Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.

Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.

To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.

We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.