From the Manufacturer
Master Appliance's Solderseal electrical connector kits consist of only the highest quality solder and heat seal connectors. Connectors are soldered for strength and conductivity, and heat sealed for superior durability. Low temperature pre measured solder with flux for greater tensile strength and superior current flow. Uniform adhesive does not overflow onto terminal to impede contact. Tubing does not reduce in length creating better insulation along with superior wire support and strain relief. Translucent, adhesive lined polyolefin shrink tubing allows visual inspection, prevents wire corrosion, and provides a water and contaminant resistant seal.