It has a rubber cover for the 2-pin connector to keep the electrical connects dry and corrosion free. Note: If your OptiMate has the black SAE connector, you need the O1. CONNECTORS: M6 eyelet to TM.
Optimate TM71 Weatherproof 12v Fused Eyelet Connection Lead
Optimate O31 Weatherproof Eyelet Lead (O1 Lead with Green Lithium Cap)
Optimate TM71 AccuMate Weatherproof Eyelet Lead.
OptiMate O1 SAE71 Weatherproof Eyelet Lead x4 Pack
OptiMate SAE71 Weatherproof Permanent Connector (01)
TM71 - Optimate 2/3/3SP/3+/4/6 & Accumate Weatherproof Fused Connector Lead
