It is recommend that you hand-wash your breast pump parts whenever possible. Frequently microwaving or running parts through the dishwasher will cause them to deteriorate faster, just as frequent sterilisation does. When cleaning, make sure parts are fully disassembled (e.g. membranes removed from valves, valves removed from breastshields, and backflow protectors taken apart).
Here is an assortment of Breast Pump parts for your convenience
Deals for Breast Pump Parts on Ebay
Click on Item with no obligation to buy: