Recycle used filters and oil quickly, safely, and easily. The oil filter crusher, crush master one (1) operates on normal shop air, delivers crushing force, accommodates all standard oil filters, and is designed for high-volume use. Will crush up to four (4) automotive spin-on filters at one time. Crushing chamber door is prevented from opening if the ram is in any position other than fully raised. Can be connected to a variety of waste oil containers.