Anti-Slip O-Ring is a standard wide neck size, to reduce slippage/leaking between parts.
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This tiny little part may well be one of our favorites! These days, it's totally normal to be fitting different parts from different brands together, and the fit isn't always perfect. If you've ever had a bottle unscrew from a breast shield, you'll know what an awful feeling it is!
Our Anti-Slip O-ring is made out of soft silicone and you use it with standard wide neck parts to keep things more secure. Use it between wide neck breast shields and bottles, our Pump2Bag clips, or with our narrow to wide neck adaptor.
Using the correct sized breastshield is really important to have the most comfortable pumping experience. We are all different shapes and sizes, and it can be really hard to know which breastshield size you will be when you start pumping.
Using a breastshield v direct latching
A baby's mouth compresses a nipple evenly all over the nipple and areola, whereas a breastshield flange is rigid. As a result, if your flange is too large, the areola will 'bunch' up into the flange, which can cause pain and nipple trauma. You want the flange to be just wide enough to fit the base of your nipple, preventing the areola from being able to get pulled into the flange.
How can I find my breastshield size?
Using our nipple ruler is a good place to start.
Get the nippler ruler by entering your email address below.
Print out the ruler. It's really important that you do not 'scale to fit'. Make sure you the scale is set to full size or 100% and the paper size to A4 in your print menu & to use A4 paper.
Fold the ruler along the fold line.
Carefully cut out the measuring circles. You're going to place these around your nipples in the next step, so try to leave as smooth and even a cut as possible so you can get an accurate measurement.
At the end of your pumping session, place your nipple through each of the cut out circles to gauge your size.The best size will fit easily around your nipple, but be quite snug.
How to get an opinion from Pumpables
If you've used the ruler and you're still not sure, we're happy to help with another opinion. If you'd like us to give you feedback, please take a photo of your nipple through each size so we can compare how each fits. You can send your pics through the 'chat' function at bottom right of the page.
The Fitting Room
For extra help, send a video of your nipple in the flange while you're pumping through our Fitting Room.
Enter your email address to get the measuring tool
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