It is great for spectra pumps when needing replacement parts in a set.
Premium Replacement Part Accessory Kit for Spectra Pumps
Premium Accessory Kit – Natural Resources: Pregnancy + Parenting
Maymom Pump Parts Compatible with Spectra S2 Spectra S1, incl 17mm Flange Valve Tube Bottle Backflow Protector [S001W-F17.5in1B] - US$20.00 : Maymom Wholesale Shopping Cart
BPA and DEHP free For SpeCtra breast pumps S2, S1, S9, M1, DEW 350 28-millimeter is the large size
SpeCtra Baby Breast Shield, Flange Only, 28 mm
Spectra Premium Breast Shield Set - Suitable for Synergy Gold, Compact – Spectra Baby UK
Spectra Breast Shields – Spectra Baby Australia
Universal Narrow Neck Breastshield Set – Pumpables
Spectra Synergy Gold Parts Kit - Backflow Protectors Valves and Tubing for Synergy Gold breast pumps!
, Spectra, Breast Shield Replacement Set, 20mm, MM012753
Spectra Breast Shield Replacement Set For Spectra S2, S1 or S9 Breast Pumps (1) 20mm wide neck flange, (1) backflow protector, (1) duckbill valve
Breast Flange Set – Natural Resources: Pregnancy + Parenting