Pump pieces required if borrowing a breast pump

RAS • Mommy to Mila Rose 9-2-18 & Isla Lily 03-21-20 🎀💗🙏🏻

I might be borrowing my friends or SIL breast pump as they had it covered under insurance and no longer using it. I was told I needed certain pieces to buy in order to use their’s for sanitary reasons obviously. Could you all let me know what are the pieces I would need in order to use their pumps ? I’m 41 weeks today, no baby or pump yet but want to ensure I know what I need for after ! Thanks !!