ST-series SpinMeister vacuum filter precleaner. Prevents large debris from entering the air stream. Significantly increases the life of a filter element, and simplifies maintenance with see-through container for quick, visual filter inspections in high dust environments. The canister is made of polycarbonate material with large dirt holding capacity to maximize maintenance routines. Easy clip release system for fast changes. Can be quickly added to most systems. 4 inch inlet and outlet.