My rating is not on the product itself, but on MD's lack of details in the description. Only one diameter is given, and I incorrectly assumed that the diameter given was for the end attaching to the sweeper hose; it isn't. That size is much larger. I had even talked to one of the technicians prior to ordering, but they couldn't give me the dimensions over the phone so I had to take a gamble.
All items I ordered seemed to be very good quality; I just can't use them.
However, I must say that the customer service people I dealt with were extremely nice. I'm still out shipping costs to return the items, but they happily are given me a refund on the purchases made.