I ordered this return filter for my vacuum cleaner. It was garbage day when it arrived so I threw away the packaging and it was picked up by the garbage collectors. Then I looked at the plastic filter bag. There should have been two filters, but there was only one (the one with a plastic connector)! Knowing that I no longer had the return packaging, I put the resulting filter in the vacuum cleaner. Then I vacuumed my living room, but every few minutes the filter holder jumped out of the vacuum cleaner! Defective plastic filter holder. So not only did I short out the filter, the one they sent was defective. $9 down the drain and lesson learned means I will NEVER order stock Revain items again.