21mm Flange & Valve Kit

This kit replaces five critical wear items for Spectra S1, S2, 9 Plus, and Synergy Gold breast pumps: a 21mm flange, duckbill valve, backflow protector, tubing, and bottle — all made from odourless, translucent medical-grade silicone. Flange outer diameter is approx. 42mm; total kit weight is under 120g. Designed for direct drop-in replacement with no modification needed — fits all generations of listed Spectra models, including firmware-updated Synergy Gold units released up to Q2 2024. The 21mm flange’s shallow funnel and wide base improve lateral stability on the breast, reducing slippage during active let-down. Duckbill valve flexes evenly across its surface — avoiding uneven wear seen in thinner, cheaper alternatives. Backflow protector includes a visible condensate reservoir chamber that can be inspected pre-use. Tubing length is optimised for UK bedside or office desk setups (approx. 35cm), with reinforced ends to prevent pull-out. All parts tolerate repeated exposure to UV light, hot water, and mild detergents. Bottle includes standard Spectra threading and volume markings etched (not printed) for durability. No adhesives, coatings, or secondary materials — pure silicone construction throughout.