Blue Sea Systems Rotating Single Entry Cable Cap, Small Pair, For Integral Wing Nut Posts, 360 Degree Rotating Top

Overview

The Blue Sea Systems 4001 is a rotating single-entry cable cap pair for insulating battery terminals with integral marine wing nut posts. The top rotates 360 degrees so the cable can enter from the angle that works best in a tight battery compartment, and the pair includes one red cap and one black cap for quick polarity identification.

The caps are molded in PVC and suit installations where the battery cable does not leave the terminal in a straight line. On boats with limited clearance around the battery, that extra freedom can make routing cleaner and help keep the terminal area covered once the connection is made.

Key features

• Fits batteries with integral marine wing nut posts
• Rotating top allows 360 degree cable entry from any angle
• Red and black pair makes positive and negative terminals easy to identify
• PVC construction for terminal insulation
• Single-entry cap design keeps the cable exit controlled at the battery post

Compatibility and fit

This model is intended for batteries that use integral marine wing nut posts. It is a practical match when you need to cover the terminal and still bring the cable in from the side that clears the battery box, tie-down, or nearby wiring.

The small pair format works well in compact battery spaces where post protection matters and cable direction cannot be forced into one fixed path. It suits owners who want a cleaner battery connection without changing the existing post style.

Installation and use

On board, this is useful where the cable changes direction as soon as the lug lands on the post. The rotating top lets you line up the opening after the connection is made, which helps reduce strain at the terminal and avoids a hard turn right at the battery.

It is a good fit for starting or house battery installations on smaller boats, service compartments, and other spaces where access is tight and the battery terminals need basic insulation.

What’s included

• One red cable cap
• One black cable cap