Lines, tees and bends have been sealed tightly. The shock mounts are properly aligned with the clips aligned with the pads on the shocks. I saw in other reviews that the line to the driver's side rear shock was too short. I used this kit on a 2004 GMC Yukon XL Denali and the lines were the correct length. I didn't run the lines in the original OEM plastic loom. I bought a new loom and routed the new channels over the OEM lines and tied them to the originally routed lines. This sealed the system with new dampers, compressor and lines. I can't say anything about the durability as the lines were only recently laid. So far I am very satisfied with the product.
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