You might not use a dust extractor often, but it's very handy to have your own once the need arises. There's no cord to restrict you, just make sure you've charged the battery.
From Amazon
M18FDCPF10-0C 18v Drain Cleaner Power Feed 10mm Body Only
ITS
Milwaukee M18 FDCPF10-0C 18V FUEL Brushless Drain Cleaner 10mm - Body with Case