Instruction: Please respond with yes if the product is a suitable substitute for the query, and no if it is not.

Input:
Query: 20mm breast shield
Product: Maymom Wide Neck Pump Part for Spectra S1/S2 Pumps; Incl Wide Mouth Flange; Not Original Spectra Flange; Replaces Spectra Shield (21 mm Two Flanges)
Answer: yes