Safety Vacuum Release Systems (SVRS) such as the IntelliFlo VS+SVRS pump are designed to prevent body suction entrapment. They do not prevent mechanical entrapment, hair entanglement, limb entrapment, or evisceration (disembowelment).
Below are the five entrapment hazards as explained by ANSI/APSP-7, Suction Entrapment Avoidance Standard.
What is the difference between body entrapment and limb entrapment?
Limb entrapment such as a hand/arm or foot/leg is trapped in an opening of a circulation outlet with a broken or missing cover. Body entrapment is the stomach, back, shoulder and arm, blocking the drain opening.
The reason for the distinction is an arm stuck in a pipe is not solved by turning off the pump or "releasing the vacuum."