Features: 1) Drier and filter apply to refrigerator, freezer that use R12, R22, R134a, R600a, R407c, R140a as refrigerant and use capillary to throttle, or other mini types hermetical refrigeration system 2) Absorbing extra water or moisture, strain feculence that might cause block problem, to avoid the system ice jam or dirt jam 3) Weight: 15g, 20g