Blue Sea Systems Standard CableCap Battery Terminal Caps, For Marine Adapter Terminals, PVC, Red/Black Pair

Overview

The Blue Sea Systems Standard CableCap is a PVC battery terminal cover pair for insulating battery terminals that have marine adapter terminals installed. It is supplied as a red and black pair, so positive and negative battery connections stay easy to identify during service, troubleshooting, and battery replacement.

This product family covers common battery cable sizes used on boats, with the small version fitting cable sizes 4, 2, and 1, and the large version fitting cable sizes 1/0 and 2/0. The caps help reduce exposed metal at the battery connection, which matters in lockers, consoles, engine spaces, and other areas where tools, gear, or nearby conductors may come close to the terminals.

Key features

• PVC construction for use as a battery terminal insulating cover.
• Red and black pair supports clear positive and negative battery terminal identification.
• Made for batteries with marine adapter terminals added on.
• Small size supports cable sizes 4, 2, and 1.
• Large size supports cable sizes 1/0 and 2/0.
• Helps cover exposed terminal hardware in battery compartments, helm consoles, and service areas where accidental contact is a concern.

Variants

The Standard CableCap is offered in two size configurations for different battery cable installations.

Both variants are red and black PVC pairs for batteries with marine adapter terminals added on. The difference is the cable size range each cap is made to fit.

• 4005: Small. Fits cable sizes 4, 2, and 1, making it suited to smaller battery cable runs and accessory battery connections that use those conductor sizes.
• 4006: Large. Fits cable sizes 1/0 and 2/0, giving more room for larger battery cables used on higher-current DC circuits.

Installation and fit

Match the cap size to the battery cable, terminal hardware, and adapter terminal arrangement before installation. The cap should sit over the terminal connection without being forced, pinched, or cut around the cable entry.

On boats with multiple batteries, color-coded terminal covers also make routine checks faster. They help crew or service technicians confirm polarity at a glance before disconnecting chargers, battery switches, inverter cables, or DC distribution feeds.

Use cases on board

This CableCap is a practical fit for battery boxes, engine room battery banks, center console battery compartments, sailboat house banks, and small craft starting batteries where marine adapter terminals are installed. It is especially useful when added ring terminals or adapter hardware leave more of the connection exposed than a basic automotive-style post cover would cover.

Maintenance and care

Inspect the caps during battery service for cracking, deformation, or looseness, especially in compartments exposed to heat, vibration, or frequent battery work. Replace any cap that no longer covers the terminal cleanly, since the value of the part comes from keeping the connection covered and easy to identify.

What’s included

• One red Standard CableCap
• One black Standard CableCap

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Orders of $100 or more qualify for free shipping when eligible. For orders under $100, shipping costs are calculated at checkout based on destination, package weight, and selected service. International shipping is available for eligible products, and certain items may require additional handling, warehouse transfers, or may ship directly from the manufacturer, which can affect processing time.

Deliveries are handled by preferred carriers such as USPS, UPS, FedEx, DHL, and others depending on your location and selected service. Estimated delivery times are displayed at checkout and may vary due to customs processing, carrier delays, weather, postal disruptions, or other circumstances beyond our control. Once your order ships, you'll receive a confirmation email with tracking information. Tracking may take up to 24 hours to update on the carrier's website and is also available through your account when applicable.

We ship throughout the United States and to most international destinations for products eligible for international shipping. International orders may be subject to customs duties, taxes, brokerage charges, or other import fees, which are the customer's responsibility and are not included in the product or shipping price. PO Boxes are accepted only when shipping through USPS, and not all packages qualify for this option. If your order does not arrive within the estimated delivery window, please contact us at info@apollolighting.com or +1 (954) 375-0100 so we can assist with locating your package.

Learn more.

Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

Learn more.

Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

Learn more.