Hi, coming from a baby retailer… i tink most bpumps fit avent, pigeon and tommee tipper (in that ranking). Perhaps u might want to consider just using medela milk bottles as milk storage instead of direct link from a bpump. Or buy second hand medela pump. Older/cheaper options are the non-flex range (flex range is new and more expensive). They work well too, esp freestyle (non-flex) U can check if can get the spare parts changed (medela distributor is J&E Baby & Mothercare, or from online retailer Pupsik) for hygiene purposes.
Anonymous