Do you have to buy the hose or is there a hose adaptor? I have a CT 36.

While it's possible to use your existing hose, it will not lock onto the Planex. The hose made for the Planex has a flange and locking mechanism to prevent it from being pulled off during operation. The Planex hose can be purchased separately and is not included with the sander. It comes with the CT 36 AutoClean dust extractor. Please note that you may have issues with the filter clogging on your CT 36 without the AutoClean functionality. Link below to the hose.https://www.festoolproducts.com/festool-496972-antistatic-hose-36mm-x-11-5-blac.html