What is the maximum air pressure for low-pressure bags?

• A. 3 psi
• B. 7 psi
• C. 12 psi
• D. 20 psi

Answer: (B)

Low-pressure bags are designed to lift and stabilize by spreading the load over a wide area with a controlled, low inflation pressure. The maximum allowable pressure for these bags is seven psi. Staying at this limit helps prevent bag rupture and keeps the lift stable as you build a solid cribbing support. Pressures around three psi tend not to provide enough lift for typical vehicle rescues, while higher pressures like twelve or twenty psi are areas associated with high‑pressure bags, which are used for different lifting scenarios and carry greater risk if used in low‑pressure configurations. Always follow the bag’s manufacturer specs and monitor the pressure with a gauge during inflation.