Solder sleeve kits contain an assortment of different sized solder sleeves– clear, heat-shrinkable tubing used to insulate and contain wire connections without the need for soldering ironsor crimping tools.
Solder sleeves form connections between two wires protecting them from moisture, strain and environmental damage.
Solder sleeves are made from a heat-shrinkable jacket, a pre-fluxed solder ring in the middle and two outer thermoplastic sealing rings. The solder ring in the middle melts to make a mechanical connection, while the outside waterproof rings prevent water from coming in.
First, strip the insulating coating from the ends of your wires. Then feed one wire in one end of the solder sleeve, so that the stripped end is in the centre under the solder ring. Then put the other wire in the other end so that the stripped ends are overlapping. Finally, use a device like a slow-output blow torch to heat the solder sleeve. It will shrink around the two wires and ensure the connection is secure.