A Core deposit is a form of deposit you pay until returning your old part. If you don't have the core at the time of purchase, you must pay the core charge. That charge is refunded to you when you return the core.
ATP Transmission filters are designed is to keep the life blood of your transmission (transmission fluid) clean. Every transmission will eventually accumulate debris from normal wear and tear. It is critical that the transmission fluid is kept clean so that the valve body and other vital components do not become clogged making them in-operable. By regularly replacing your transmission filter, you will be extending your transmissions life and reduce the possibility of costly repairs that could have been avoided.