Pro Maxx Exhaust Air Jack, 21" 3,400LB

Aids in recovery from mud, sand or snow. Assists with changing tires and installing tire chains. For vehicles, trailers, campers and ATVs. One-way back valve keeps jack inflated for up to 45 minutes. Can be deflated slowly or as fast as 5 seconds. Made of durable PVC-coated woven polyester fabric, double layered on top and bottom to prevent punctures.