Can I use the CT 15 Hepa with a power tool connected?

Yes you can use the CT 15L with a power tool connected and is delivered with a 27mm hose. However, be mindful the CT 15 (part number 577414 ) is delivered with the black hose which is anti-static, the CT 15 (part number 574866, no longer available for purchase) is delivered with the non-anti static grey hose, so static may build up in this hose during use.