4 Adjustable Levels: You can adjust the length in 4 levels by using the long pipe. When installed on the CPLB-ACE-28S, you will only have 2 levels of adjustment of 37.8 and 42.9 inches (960 and 1075 mm). When using a long pipe, please make sure to install at least 3 points to prevent the fall of earthquakes, etc.