The cam-lock provides a positive lock that holds your level tight

You can operate the R-M55 in vertical mode

Mix and match the sections you need to fit your space and help meet sump capacity requirements

There are advantages and disadvantages to both set-ups

Disco Automotive Hardware 1012PK Short Extruded U-Nut, M5 x 80 mm Screw, Black Phosphate sandertype_oscillating The cam-lock provides a positiveProduct Description Black Phos. Short Extruded "U" Nuts Specifications More Information Part No. 1012PK Product Line DCO MFR Model 1012PK Manufacturer DISCO AUTOMOTIVE HARDWARE UPC 841213021082 Brand Disco Automotive Hardware Part Status A Color Black Phosphate Type Short, Extruded