Highlifter Shop › High Pressure Cylinder 9:1 Image 1 of 2 Image 2 of 2 High Pressure Cylinder 9:1 $32.00 High Pressure Cylinder 9:1 Ratio Highlifter. The tube that rides between the low pressure pistons. Quantity: Add To Cart Added! High Pressure Cylinder 9:1 Ratio Highlifter. The tube that rides between the low pressure pistons.