Reduce 24-28mm Flange Tunnel Down to 13mm, 15mm, 17mm, 19mm or 21mm! They work great with wearable breast pumps and collection cups! 

Great tool for Lactation Consultants to use for sizing. 

Compatible with following pump Flanges and more: 

• Medela

• Spectra

• Lansinoh

• Motif

• Elvie

• BabyBuddha

• Hygeia

• Evenflo

• Willow

• MomCozy

• Elvie

• Youha