ADT ASVC8858A5 6-Inch Vertical Vacuum Suction Cup with Metal Handle Durable metal handle, designed for convenient hand placement. Large-volume pump for quick attachment on curved or flat surfaces. Red-line indicator warns user of any vacuum loss. Check valve allows repumping without loss of remaining vacuum. Minimum Radius for Curved Load: 12" [305 mm] Load Capacity: 70 lbs. [32 kg] per cup