second hand pump

rachael_c26

I recently was given an Ameda Purely Yours Double Electric Pump.
I thought I'd need to replace the flanges and bottles, but when I get online to order replacement parts, the replacement parts kit comes with everything else but those.

Soo do I just boil the flanges and bottles and order the replacement parts kit?

My question. What all parts need to be replaced before using this second hand pump?

I looked it up and best I saw this is a closed system pump. This is true, right?

Thanks y'all!