What Does Anode Cap Mean?
An anode cap is a device that seals and protects the critical connections between an anode and a lead wire. Anode caps also provide stress relief, electrical insulation and water/moisture proofing at the lead wire exit point.
Anode cap use is considered an ideal and cost-effective solution for premature system failure problems such as a lead wire becoming disconnected from an anode due to corrosion.
Anode caps are also known as heat shrinkable anode caps.
Corrosionpedia Explains Anode Cap
Anode caps are manufactured with a special, unique and highly stabilized polyolefin material used to mold the cap. Each cap is expanded in such a way that there is sufficient clearance for easy installation over the lead wire and the anode. A rubber-based sealant is also used with anode caps so the sealant adheres to the anode and the wire insulation is uniformly coated on the inside of the cap.
A propane torch is used to heat the anode cap during installation. As the temperature rises above 120°C (250°F), the rubber sealant softens and the cap shrinks tightly to hold the anode and lead wire. When cooled, the cap and sealant provide a durable and watertight encapsulation that will retain its flexibility and integrity over a wide range of temperatures.