Yes, you can put the washable parts of the breast pump (except the silicone tubes, caps, motor and adapter) in the Philips Avent steriliser. Philips explicitly recommends this for sterilisation with steam.

The two tubes connect the collection shells to the motor unit and ensure the suction rhythm that pumps the milk out of the breast. They channel the vacuum from the motor to the breast pads to enable breast milk to be expressed.

Cleaning the Philips Avent Hands-free Double Electric Breast Pump is relatively straightforward. You should clean the pump before the first use and after every pumping session, focusing on parts that come into contact with milk. The motor unit and power adapter can be wiped with a soft, damp cloth, while keeping the silicone tubes dry to prevent damage. Disinfection is not required for parts that do not contact milk.