Grease caps seal and protect low-voltage wire connections between the solenoid and timer.Connects or repairs sprinkler valves Outdoor Lighting(Decks, driveways, lamp posts, landscape) Septic Systems Golf Courses Other underground electrical wiring applications Protects and waterproofs low-voltage wire connections Long-term electrical properties reduce callbacks and rework The grease cap connects a wire range of 2-5 #18 AWG through 2 #12 plus 1 #16 AWG solid or stranded copper wire