That would help, but this particular connection is being "sucked
together", the DC is not trying to blow it apart. One should be
enough. That's all I have on mine, and my setup is identical to what
he is trying to do.

Good to hear that you have a similar setup as what I am trying to
create. May I ask you a question about your setup:

Do you use a QuickConnect to connect the 6" hose to the power tool? I
can only find QuickConnect in 4" diameter, but not 5" or 6".

Thanks.

Jay Chan