Will this fit any hull cleaner?

No. It is made for Nemo Power Tools' hull cleaner only. It will not fit other brands or generic brush shafts.

What does the hex head do?

It is the drive coupling that turns the brush head. If yours is stripped or rounded, the brush stops spinning properly.

It is the hex-head attachment, not the brush itself. Check which part has failed before ordering.

It seats on the hex shaft and is held by the tool's normal fitting. No special tools are needed.

If you clean hulls regularly, a spare is sensible. A stripped drive ends the job until a replacement arrives.

At Nemo Power Tools, for $48.00, 35% under what the other stores charge, as of our latest check.

3 stores we checked sell it, including Nemo Power Tools, eBay, Hydropool.com.

$48.00at Nemo Power ToolsChecked 36 min ago

35% under what the other stores charge

Compared across 3 stores. Prices are checked against each store and labelled with when.

It checks today's price at every store, compares the alternatives and answers in about a minute.