Maymom3rd Gen Thread Changer or Bottle Converter; Allow Spectra S1 S2 Pump Wide Mouth Flange Compatible w Medela Bottle, Ameda Bottle, Lifefactory Bottle, Dr. Brown Narrow; No Leak, No Fallen Bottle

Works as described for connecting spectra s1 to Mandela bottles. I wanted to be able to collect in smaller bottles when little one gets here because I know I won’t be able to fill an entire bottle at first because I also plan to breast feed. I could only find small collection bottles via Mandela. It seems to be a firm fit.

I used this to pump into narrow mouth bottles with my spectra s1 pump and they work well. I like that it came in a pack of 4 so I don't have to wash them immediately after use.

Makes a great seal, great for pumping into Medela storage bottles with Soectra pump

I honestly just bought these adapters on a whim, figuring extras couldn't hurt. Before these little guys, attaching the bottles felt like a balancing act doomed to end in a milky mess on the floor (yes, it happened). These thread changers twist right on, connect my Spectra flanges to my trusty old Medela bottles securely, and most importantly, no leaks. No sudden bottle detachment sending liquid gold flying. They just do the simple job they're supposed to do, which is a win.Pros:Super easy to screw on and off.Creates a tight, secure seal (no unexpected milk showers!).Lets you use different bottle types with your Spectra pump.Saved me from having to buy a whole new set of bottles.Cons:Just one more small piece to wash and keep track of in the pumping parts chaos.You do need to make sure you twist them on properly with the rubber piece, but it's not difficult.

With my first child I had a Medela pump and so had a stock pile of Medela bottles for breast milk refrigerator storage. I also had adapters for my Medela flanges that would attach directly to my Tommee Tippee bottles for direct bottle pumping as we used those to feed our first child.With our current family addition, I'm using a Spectra S2 and wanted to leverage all of the stockpiled bottles, etc. I used with my prior pumping efforts. These adapters supported that need! So far, three weeks into use, they still fit well with my Spectra flanges and Medela bottles as well as supports the use of the Tommee Tippee adapter to pump directly into those bottles. The latter has a two adapter in tandem experience and so makes it heavier thus I'd recommend some careful attention while pumping and some extra hand support if you're pumping hands free.So far no leaks but I'm extra careful when setting the bottles down (first detaching the tubing from the flange) when done pumping to minimize some accidental tumbles. I did have one knock over of a bottle with these adapters in place and a Medela bottle and thankfully no leaks though milk does then find its way into the thread area which results in some small loss of liquid gold when transferring no matter how much tapping you do (pumping mommas know the tap dance performed with certain pump parts following a pumping session!). I now have a variety of other standard opening feeding bottles and these adapters support easy attachment to those as well.Based upon my experience thus far, I would purchase again.Update 2/23/17: These adapters are still holding up well. I've had no leaks with them thus far. Also added some pictures to this review to show use of the adapter with a Spectra flange and a Medela collection bottle as well as the adapter doubled up with the Medela to Tommee Tippee adapter to attach directly to a Tommee Tippee bottle.

These work well for what is advertised, but have no suction so if you moved wrong, like spill a bit of milk while pumping or carrying, they will leak.I recommend this product, just be careful when moving with them.

I use the Spectra breast pump that fits only wide necked bottles. I use the Medela storage bottles as I love the tray they came with and the tops that can change day and time. One problem. The Medela bottles are small necked so I can't pump directly into them. Consequence? I have double the bottles to wash at the end of the day. That adds up after a day of pumping and takes a lot of my valuable time and drying space away at the end of the day.Solution? These beautiful things! They screw into the flange and any small neck bottle can be screwed into it. I have experienced no leaks pumping into Medela bottles and Dr. Brown's bottles. I have used them with and without the purple O-Ring seal (one of them was lost to the drain while washing...oops!) I experienced no difference with or without the O-Ring so the original product that comes without it is just as good.It is easy to clean and has saved me a lot of time and bottle washing. This is truly a genius product in my opinion and I highly recommend it!

These bottle adapters are PERFECT if you're using a different pump with your second child. I used a Medela pump with my first but am switching to a Spectra with this baby and hated the idea of having to get new collection bottles. This is just a small extra piece that makes my Medela bottles compatible with my Spectra S2.