I have a DC28 and I cleaned the filter and then put it in the oven to dry. anyway, my vacuum cleaner made a high-pitched whistle. It took me a day to figure out what I did, but I ended up ordering it (can't beat the price since I was trying to order this $40+ hard plastic from Dyson). It fits perfectly and no whistle from the vacuum cleaner if I notice anything else I will update my review!