The Auto-tapper automatically frees off-specification pellets from the screening decks of pellet classifiers. The Auto-tapper induces a small resonance through the perforated classifier deck that coordinates with the linear vibrating action to gently jolt any pellets blocking the screen and permit their continued movement toward the reject discharge, while opening the holes to allow on-specification pellets to slide through the screen. Featuring a pneumatic actuator set on an adjustable cycle timer, the Auto-tapper operates almost silently without human supervision. The device is ideal for separating plastic pellets, chemicals, food ingredients, animal feeds, sludge and other pelletized products, and can be considered when the pellets are sticky, crumbly or when a high percentage are likely to be off-specification. — The Witte Co., Washington, N.J.