With the JBL ProFlora Adapt u201-u500 you easily change the pressure reducer over from disposable cylinder u201 to disposable cylinders u500.JBL ProFlora Adapt u201-u500+ adapts the pressure reducer u201 (5/8 inch UNF) to the disposable cylinders u500 (M10 x 1)+ assembly: screw the adapter into the pressure reducer and then screw the pressure reducer onto the cylinder u500+ enables the pressure reducer (thread 5/8 inch UNF) to be screwed onto u500 disposable cylinders with thread M10x1+ dimensions (L/H/W) 96/140/20 mm+ package contents: adapter for pressure reducer, ProFlora Adapt u201-u500, from u201 onto u500