ROLLING LOBE AIR SPRING - Heavy duty rolling lobe air spring designed for trailer air suspension systems to maintain proper ride height and absorb road shock. ALUMINUM BASE CONSTRUCTION - Corrosion resistant aluminum base plate built for long service life in commercial truck and trailer applications. LOAD CAPACITY - Rated at 7,650 lbs at 100 PSI and 6,100 lbs at 80 PSI for reliable suspension performance under heavy loads. DIMENSIONS AND TRAVEL - Compressed height 7.4 inches, extended height 24.2 inches, maximum diameter 10.62 inches. MOUNTING CONFIGURATION - Bottom plate: 4 bolt holes with 2.25 inch center-to-center spacing and 10.75 inch diameter. Top plate: 1 bolt hole with 10.38 inch diameter. Parallel mounting alignment.