Can I use the CT 15L (577414) with my Kapex Saw?

You can use the CT 15 however we do recommend you buy an antistatic hose with D36 connector to allow for more volume of dust to be extracted.
Depending on wattage of the tool, the CT15 has a maximum connected load of 1200 watts so if placed under load may trip the circuit breaker in the extractor. To overcome this the tool would need to be operated off a separate circuit.