Breast pump thru insurance

So two years ago i had received my medela pump in style breast pump and well i couldnt get much milk with my son well fast forward to me having my daughter i have been pumping since September 1st i had my daughter on the 30th of August and well it as came to my attention that my pump membranes are not good anymore and i was wondering if i should contact my insurance company to see if they will pay for my membranes or should i just go buy them at Walmart which they have a 2 pack for 14 dollars is it worth me calling insurance or just buy them