2 Pcs Trailer Air Bag Spring Replaces 9121, W01-358-9121, 905-57-019, 1R13-039

This product consists of air springs made from 4140 grade steel and advanced composite pistons, with 5.00 mm thick rubber. It includes a 3-year unlimited mileage warranty.

• The description claims a 3-year unlimited mileage warranty.
• The description claims studs made from 4140 grade steel that are 30% more durable.
• The description claims an industry-leading leak-proof ratio post leak tests.
• The description claims 5.00 mm thick rubber, surpassing standard requirements.