I need an extention hose for my washing machine. The manufacturer's hose is a standard 21mm. I think what you are saying is that one end of this is 21mm and the other end is 29mm. Do I fit the 21mm end to my hose with PPFE tape and a jubilee clip? The other, 29mm, end - is that supposed to be cut off? So it ends in a standard hose size, which I can then attach to the spigot under the sink? I can't see how it would fit securely otherwise. Thanks, Laura