Medela Replacement Parts?

kenna_4

I pumped with a medela swing full time for about 5 months with DD. The pump hasn't been used in 2 years. I am wondering which parts should be replaced to make sure it works in tip top shape when I need it again in a few months. I won't be pumping full time with it again, but I'd still like it to work well when I need to pump the odd bottle here and there.

Thanks!