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My vacuum is sucking like it did the day I bought it, and the filter seated into the T-Series housing without any forcing or gaps. For the price, getting a genuine 303173001 replacement instead of some off-brand gamble was worth it.

It fit my T-Series without any fuss, so the part number matching is spot on. Suction feels like it did when the vacuum was new, and it’s holding up well after a month of weekly use.

Been using this filter for a few weeks now and it slides right into my T-Series like the original. The fit is exact, no fiddling to get the seal tight, and it's caught everything the dog drags in. Way better than the clogged-up one I was nursing along.