With Ingersoll Rand's 4-Cup Vacuum Handling Devices, minimal effort is required for one person to lift and place flat, non-porous parts weighing up to 300 pounds. Once the vacuum cups are fully engaged, a safety interlock, indicated by an air gauge and a green signal, prevents accidental release of the load. Ergonomic design: A pivoting handle (on models 87306338 and 87306486) allows the operator to maintain a comfortable arm position as the load is lifted, moved, positioned and lowered. Model ZV4S uses the same ergonomic grip surface, but has non-pivoting controls that permit single-handed up/down movement and vacuum on/off. Box or flat surface quality is protected with positive secure gripping and pickup/setdown. Note: Vacuum cups require a flat, non-porous surface. Even slightly porous surfaces, like cardboard, can be tricky applications. Contact factory for applications with porous surfaces. Durable effector designed to the ASME B30.20 specification for Below-the-Hook Lifting Devices.