The heater core has two hoses - an inlet and outlet. This kit caps off the hose connections so you can delete these hoses when removing your heater core.
This kit has two caps - an aluminum one for the upper radiator hose (uses the original spring clip) and a silicone cap for the crossover pipe from the expansion tank. The crossover pipe has multiple functions depending on the vehicle specs and options but most of it up to the thermostat can be removed. Evaluate the pipe connections between the thermostat and the heater core hose and determine where the best place is to cut the pipe. A manual transmission car will have the simplest and most basic layout (i.e. no heat exchanger connections). The silicone cap can be used anywhere along the length of the pipe.
Top tip: the factory hoses use either a spring clamp (easy) or a band clamp. The band clamp needs to be snipped off but use caution so you don't nick or damage the section you're keeping.
BMW Fitments:
1 Series
E82 (08-13) > 128i
E82 (08-10) > 135i
E82 (11-12) > 1M Coupe
3 Series
E90 / E91 / E92 (06-13) > 325i
E90 / E91 / E92 (06-13) > 325xi
E90 / E91 / E92 (06-13) > 328i
E90 / E91 / E92 (06-13) > 328xi
E90 / E91 / E92 (06-13) > 330i
E90 / E91 / E92 (06-13) > 330xi
E90 / E92 (07-10) > 335i
E92 (11-13) > 335is
E90 / E92 (07-10) > 335xi