To give you a little information, all of our pumps work off suction and have the same size flange. Generation 1 - 100ml one-peice silicone pump with no suction base. Generation 2 - 100ml or 150ml one-piece silicone with suction base. Generation 3 - 160ml or 250ml with thicker silicone walks and a slightly stronger suction. Can be interchanged from a pump to a baby bottle, feeding spoon, sippy spout or even a storage container. Many mums love our Gen 1 and Gen 2 pumps for their compact, lightweight, single piece constructon. Alternatively, ths Gen 3 pump features a thick silicone body that is perfect for mums looking for a stronger level of suction from their pump. We designed the Gen 3 range to be future proof and added over time, growing with a baby from breastfeeding to their solids journey and behind as they gain more independence and confidence to self-feed. As for accessories, the Silicone Flower Stopper is used to seal milk in and prevent spills. The Silicone Cap acts as both a dust cap and a stopper. It creates a stronger seal around the flange and prevents spills, which is greater for when you are on the go, and protects the flange from any nasties it comes into contact with. Another great feature of the silicone lid is that it ha a little opening flap on the top that releases air once you place it on the pump, to allow for an even tigher seal. The Breast Pump Strap keeps the pump around your neck so that it doesn't fall or get kicked off when you're expressing.