Blue Sea Systems Standard CableCap Large Pair

The Blue Sea Systems Standard CableCap, Large Pair, is sized for heavier 1/0 and 2/0 AWG cable on a battery with a marine adapter terminal added onto its original post — the larger counterpart to the small-cable version, PN 4005. This cap snaps completely over the finished connection to insulate it fully, satisfying typical ABYC insulation guidance for exposed positive battery terminals on most recreational vessels.

Key features

• Sold as a pair — one black, one red
• Fits cable sizes 1/0 and 2/0 AWG
• For batteries with marine adaptor terminals added on
• PVC construction resists corrosion and weathering in the marine environment

This size matches the heavier cable typical of a house battery bank's main feed or a high-draw start battery circuit. If your cable is lighter — 1, 2, or 4 AWG — the small pair (PN 4005) is the correct fit instead; a large cap won't seat snugly over a smaller cable and terminal, leaving gaps that defeat the point of adding insulation in the first place around the exposed connection.

As with the small size, confirm the battery has an adapter terminal added on rather than an integral wing nut post before ordering — the Rotating CableCap (PN 4001) is the correct part for wing-nut-style terminals instead, and the two families aren't interchangeable in fit or design. Color-code consistently (red for positive, black for negative or ground) across the whole installation so circuit polarity is obvious at a glance during future maintenance or troubleshooting work down the road.