The CFH-3081 Cartridge Heater is just the plain heater as we purchase it the CFH-3081-01 Cartridge Heater assembly is the assemble part as installed into the CFH-4000-X Heater Assembly. Bellow is the list of part that make up the CFH-3081-01 Cartridge Heater assembly.

CFH-3081-01 Cartridge Heater Assembly
Part Number DescriptionQTY.UM
08144 1/4 Heat Shrink2.00IN
CFH-3081 Cartridge Heater1.00EA
E-HSL-101 Heat Shrink Label Tube0.75IN
E-RTT-102 Ring Tongue Terminal, #102.00EA